Article
Agronomy
Juan Carlos Suarez, Cristian Gelpud, Jhon Eduar Noriega, Fausto Andres Ortiz-Morea
Summary: The study investigated the physiological characteristics and stress resistance mechanisms of different cocoa genotypes under various light levels, revealing that some genotypes exhibit good adaptation to full sun conditions, resulting in greater carbon utilization efficiency and energy dissipation mechanisms.
Article
Plant Sciences
Hu Sun, Qi Shi, Shi-Bao Zhang, Wei Huang
Summary: The study found that leaf nitrogen content significantly influenced the response of PSI to fluctuating light in tomatoes grown under nitrogen deficiency. High-nitrogen plants were more susceptible to over-reduction of PSI compared to low-nitrogen plants, which gradually increased PSII electron flow to avoid this issue.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2022)
Article
Agronomy
Hibiki M. Noda, Hiroyuki Muraoka, Kenlo Nishida Nasahara
Summary: Leaf optical properties play a key role in interpreting remote sensing data on vegetation canopy structure and functions. By studying the seasonal patterns of leaf optical properties in different tree species, we can better understand the growth and development of vegetation. The reflectance and transmittance spectra of leaves exhibit distinct seasonal changes.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Plant Sciences
Kun Yan, Huimin Mei, Xiaoyan Dong, Shiwei Zhou, Jinxin Cui, Yanhong Sun
Summary: Jerusalem artichoke showed vulnerabilities in both PSII and PSI under salt stress. The inactivation of PSII, a passive consequence of PSI photoinhibition, hardly helped protect PSI.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Horticulture
Hyo Gil Choi
Summary: This study investigated the influence of TiO2 foliar spray on the yield and photophysiological responses of cherry tomato under low ambient light intensity. Results showed that TiO2 treatment increased electron transport and CO2 fixation in plants under low light conditions, while reducing the fruit size and delaying ripening time. Additionally, TiO2 treatment significantly increased fruit hardness and yield in cherry tomatoes.
Article
Plant Sciences
Chaonan Tang, Jianming Xie, Jian Lv, Jing Li, Jing Zhang, Cheng Wang, Guoping Liang
Summary: This study found that zeaxanthin pretreatment significantly enhances the tolerance of peppers to chilling stress by reducing damage, increasing fresh weight and photosynthetic pigment content, and improving the photosystem response. Additionally, zeaxanthin treatment upregulates antioxidant enzyme activity, reduces oxidative stress, and induces changes in endogenous zeaxanthin metabolism.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2021)
Article
Plant Sciences
Boda Liu, Jing Zhang, Zhenying Zhang, Yong Sui, Hengxin Zhu, Yaru Shi, Xiuyu Sui, Yuwu Li, Xinqiang Jiang
Summary: This study found that 50% shading treatment can increase the growth height of Aralia elata and reduce the activity of antioxidant enzymes and relative conductivity. It also increases chlorophyll content and improves the maximum quantum efficiency of photosystem II, quantum efficiency of electron transfer, and photochemical quenching. Meanwhile, antioxidant enzyme activity, chlorophyll content, maximum quantum efficiency, quantum efficiency of electron transfer, photochemical quenching, and non-photochemical quenching are all higher in top leaves compared to central and bottom leaves.
PLANT GROWTH REGULATION
(2023)
Article
Plant Sciences
Martijn Slot, Daniela Cala, Jorge Aranda, Aurelio Virgo, Sean T. Michaletz, Klaus Winter
Summary: The study surveyed the leaf heat tolerance of 147 tropical lowland and pre-montane forest species, finding that heat tolerance partially decreases with increasing environmental temperature, but is positively correlated with the thermal time constant of leaves. Additionally, species with structurally more costly leaves have a reduced risk of leaf loss during hot spells.
PLANT CELL AND ENVIRONMENT
(2021)
Article
Horticulture
Kun Yan, Yibo Zhi, Hongyan Su, Jinxin Cui, Yanan Sun, Suxin Li, Guanyu Zhou
Summary: Photosystem stability and cooperation in halophytic shrub wolfberry were investigated under salt stress. Results showed that wolfberry exhibited high tolerance of photosystems under 200 mM NaCl stress, but suffered significant photoinhibition in both PSII and PSI under 300 mM NaCl stress, with PSI being more severely damaged.
SCIENTIA HORTICULTURAE
(2023)
Article
Agronomy
Paria Eskandarzade, Mahboobeh Zare Mehrjerdi, Fardad Didaran, Nazim S. Gruda, Sasan Aliniaeifard
Summary: The study investigated the effects of light intensities and harvesting times on the photosynthesis of green and purple basil plants. The results showed that purple basil had the highest photosynthetic and protective pigment levels when harvested at noon, while the highest levels of soluble and storage carbohydrates were detected in purple basil grown under full sunlight and harvested during the early morning. Light treatments also affected the maximum quantum yield of photosystem II (FV/FM) and the non-photochemical quenching (NPQ) in both basil varieties.
Article
Plant Sciences
Nqobile Truelove Ndhlovu, Farida Minibayeva, Richard Peter Beckett
Summary: Lichen substances have various functions such as UV screening and antimicrobial activity, and they can also reduce photoinhibition and protect desiccated lichens.
ACTA PHYSIOLOGIAE PLANTARUM
(2022)
Article
Plant Sciences
Yiwen Cao, Yonghui Pan, Min Wang, Tianheng Liu, Xusheng Meng, Shiwei Guo
Summary: This study investigated the response of Lonicera japonica to different nitrogen sources and found that NH4+-N supply reduced plant growth and photosynthetic performance, and induced photoinhibition, which could be explained by the decreased light absorption ability, damage to the oxygen-evolving complex, and blocked electron transfer during the photosynthetic light reaction process.
JOURNAL OF PLANT GROWTH REGULATION
(2023)
Article
Plant Sciences
Erhard E. Pfuendel
Summary: The study simultaneously measured the fluorescence characteristics of cherry laurel leaves in two spectral windows, providing insights into the performance of the photosystems and distribution of PSI fluorescence.
PHOTOSYNTHESIS RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Danyan Chen, Kaikai Yuan, Junhua Zhang, Zhisheng Wang, Zhangtong Sun, Haihui Zhang, Jin Hu
Summary: The quality of seedlings has a significant impact on the subsequent survival, quality, and yield of tomatoes. In this study, the response of tomato seedlings to vertical light was investigated, and the continuous trends of chlorophyll fluorescence parameters under six different vertical light intensities were analyzed. The results showed that the parameters were highly correlated with the photosynthetic photon flux density and the day of light processing. Increasing light intensity led to a decrease in certain parameters, an increase in curve deviation, and a decrease in the scaling factor. The phenomenon of photoinhibition was relieved on certain days of light processing. Seedling health, dry weight, and certain biochemical components were significantly higher under specific light intensities. It can be concluded that the rapid and proper adjustment of light intensity is crucial for obtaining high-quality tomato seedlings.
Article
Plant Sciences
Richard Peter Beckett, Thomas Roach, Farida Minibayeva, Silke Werth
Summary: The photosynthetic apparatus of lichen photobionts, including cyclic electron flow and photoprotection, was studied using chlorophyll fluorescence analysis and near-infrared absorption. Sun species exhibited lower PSI acceptor side limitation and higher flavodiiron-mediated pseudocyclic electron flow compared to shade species. Melanised lichens had lower Y[NA], higher NDH-2-type cyclic flow, and higher non-photochemical quenching, while shade species displayed faster relaxing NPQ. Cyclic electron flow was a prominent feature in all lichens regardless of habitat.
PHYSIOLOGIA PLANTARUM
(2023)
Article
Plant Sciences
Mitsutoshi Kitao, Evgenios Agathokleous, Hisanori Harayama, Kenichi Yazaki, Hiroyuki Tobita
Summary: The study found that the ratio of C(c) to C(i) in leaves of Japanese white birch remains constant under different CO(2) concentrations and light conditions. During progressive drought, the overestimated C(i) was corrected by stomatal patchiness and/or cuticular transpiration, leading to a constant ratio of C(c) to C(i).
PHOTOSYNTHESIS RESEARCH
(2021)
Article
Forestry
Evgenios Agathokleous, Mitsutoshi Kitao, Xiaona Wang, Qiaozhi Mao, Hisanori Harayama, William J. Manning, Takayoshi Koike
Summary: This study evaluated the protective effects of ethylenediurea (EDU) on Japanese larch against ozone-induced damage. The results showed that EDU concentrations of 200-400 mg/L could protect seedling communities and saplings against ozone-induced inhibition of growth and productivity. Among the concentrations tested, 400 mg/L of EDU offered the maximum protection to Japanese larch plants under high competition and ozone-induced stress.
JOURNAL OF FORESTRY RESEARCH
(2021)
Article
Environmental Sciences
Mitsutoshi Kitao, Yukio Yasuda, Eiji Kodani, Hisanori Harayama, Yoshio Awaya, Masabumi Komatsu, Kenichi Yazaki, Hiroyuki Tobita, Evgenios Agathokleous
Summary: The Electron transport rate (ETR) is used as an indicator of photosynthetic activity but does not linearly correlate with the net photosynthetic CO2 assimilation rate (A) under changing environmental conditions. A practical approach to estimate A based on ETR, stomatal conductance (g(s)), and leaf temperature, taking into account intercellular CO2 concentration (C-i) and temperature-dependent electron partitioning, showed good agreement with measured A in various conditions. This approach can also be used to estimate canopy-level CO2 uptake in different environmental conditions without requiring biochemical information.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Forestry
Hisanori Harayama, Hiroyuki Tobita, Mitsutoshi Kitao, Hirokazu Kon, Wataru Ishizuka, Makoto Kuromaru, Kazuhito Kita
Summary: The study found that drought hardening and the use of JFA-150 containers significantly improved the survival rate of Japanese larch seedlings. The application of antitranspirant also proved to be effective in increasing survival. High-potassium fertilization, on the other hand, did not show a significant impact on seedling survival.
Article
Biochemistry & Molecular Biology
Sapit Diloksumpun, Nalin Wongkattiya, Kittisak Buaban, Tharinee Saleepochn, Panawan Suttiarporn, Suwaporn Luangkamin
Summary: This study investigates the terpenoid compositions and antibacterial and antioxidant activities of eucalypt leaf oils from different clones grown in Thailand. The results show that these oils contain various compounds and exhibit significant antibacterial and antioxidant effects. The hybrid oil demonstrates a broader antibacterial activity and a potent antioxidant capability.
Article
Plant Sciences
Mitsutoshi Kitao, Hisanori Harayama, Kenichi Yazaki, Hiroyuki Tobita, Evgenios Agathokleous, Naoyuki Furuya, Toru Hashimoto
Summary: Based on a combination of a glasshouse experiment and a field survey, this study found that soil water conditions have a significant impact on the competitiveness of Japanese white birch against perennial weeds. The research shows that under waterlogging conditions, Japanese white birch has a lower competitiveness for light resource, while the competitive weed Eupatorium showed the opposite response. The findings suggest that maintaining soil moisture levels that are not excessively high is favorable for the photosynthetic performance and growth competitive ability of Japanese white birch.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Forestry
Mitsutoshi Kitao, Evgenios Agathokleous, Hisanori Harayama, Satoshi Kitaoka, Akira Uemura, Kenichi Yazaki, Hiroyuki Tobita
Summary: To improve the drought tolerance of container seedlings of Japanese larch, adequate nitrogen supply and limited water supply are crucial. Higher leaf nitrogen decreases photosynthetic and photochemical efficiency, impairing drought tolerance. Conversely, lower shoot biomass and leaf nitrogen can delay soil drying and reduce photoinhibition.
EUROPEAN JOURNAL OF FOREST RESEARCH
(2022)
Article
Forestry
Duriya Staporn, Dokrak Marod, Jetsada Wongprom, Sapit Diloksumpun
Summary: The establishment of exotic plantations is an effective method for the restoration of degraded lands. This study investigated the effects of stand structure and environmental factors on native species regeneration under the canopies of three exotic plantations in northeastern Thailand. The results highlighted the importance of soil properties and environmental factors in influencing the composition and regeneration of native species.
Article
Forestry
Hisanori Harayama, Ikutaro Tsuyama, Akira Uemura, Mitsutoshi Kitao, Qingmin Han, Shigeo Kuramoto, Hajime Utsugi
Summary: Competition between planted seedlings and vegetation significantly affects their survival and growth. This study compared the survival and growth of hybrid larch F-1 and Japanese larch at different competitive levels. When more than three-quarters of the seedling surface was covered by vegetation, the survival rate of Japanese larch dropped substantially, while hybrid larch F-1 maintained a high survival rate. The height growth of both species decreased with increasing coverage.
Article
Forestry
Kiyosada Kawai, Surachit Waengsothorn, Atsushi Ishida
Summary: Sapwood density is correlated with water conduction and non-structural carbohydrate reserves in trees during the dry season. The loss of conductivity is related to sapwood density in a quadratic function, with high Loss of conductivity observed in both low and high density species. Thick bark is associated with lower loss of conductivity and dense-barked species have higher non-structural carbohydrate concentrations in branch xylem. These results indicate that sapwood density plays an important role in regulating tree physiology during the dry season.
TREES-STRUCTURE AND FUNCTION
(2023)
Article
Forestry
Evgenios Agathokleous, Mitsutoshi Kitao, Masabumi Komatsu, Yutaka Tamai, Hisanori Harayama, Takayoshi Koike
Summary: This study examined the impact of climate change on the growth and health of Japanese larch seedlings by modifying fertilization and promoting mycorrhization. The results showed that adequate fertilization stimulated plant growth and biomass production, while mycorrhizal treatment counteracted the effects of fertilization. Drought significantly reduced photosynthesis and induced senescence, and also altered nutrient content in the leaves. This study provides a basis for further research on producing high-quality seedlings under climate change.
JOURNAL OF FORESTRY RESEARCH
(2023)
Article
Forestry
Hisanori Harayama, Ikutaro Tsuyama, Mitsutoshi Kitao, Takeshi Yamada, Naoyuki Furuya, Hajime Utsugi, Shozo Sasaki
Summary: Research shows that the initial height and root collar diameter of Japanese larch seedlings have a significant impact on their height after planting, while the age of the seedling and planting area become more important over time. Furthermore, there were no differences in seedling height between the different types of seedlings (bareroot and container-grown) during the four growing seasons after planting.
Article
Multidisciplinary Sciences
Atsushi Ishida, Keiko Yamaji, Takashi Nakano, Phanumard Ladpala, Ananya Popradit, Kenichi Yoshimura, Shin-Taro Saiki, Takahisa Maeda, Jin Yoshimura, Kohei Koyama, Sapit Diloksumpun, Dokrak Marod
Summary: This study analyzed the characteristics of the seasonally dry forests in Southeast Asia and found a positive correlation between light-saturated photosynthetic rates and foliar nitrogen and phosphorus levels. The differences in nutrient and water use and leaf habits were also matched to the variation in soil properties among the forest types.
Article
Forestry
Kiyosada Kawai, Kanji Minagi, Tomomi Nakamura, Shin-Taro Saiki, Kenichi Yazaki, Atsushi Ishida
Summary: This study examined the coordination between different types of parenchyma and essential xylem functions in the secondary xylem. The results suggest that the fraction of parenchyma underlies species variation in xylem hydraulic and carbon use strategies.
