Journal
REVISTA BRASILEIRA DE ENGENHARIA AGRICOLA E AMBIENTAL
Volume 27, Issue 1, Pages 34-41Publisher
UNIV FEDERAL CAMPINA GRANDE
DOI: 10.1590/1807-1929/agriambi.v27n1p34-41
Keywords
Gossypium hirsutum L.; salinity; acclimatization; hydrogen peroxide
Categories
Ask authors/readers for more resources
This study evaluated the effects of irrigation with waters of different electrical conductivities and foliar applications of hydrogen peroxide on the concentrations of photosynthetic pigments and quantum yield of naturally colored cotton genotypes. The results showed that high electrical conductivity water and high concentration hydrogen peroxide reduced the concentrations of photosynthetic pigments, but did not damage the efficiency of photosystem II.
The objective of this study was to evaluate the quantum yield and concentrations of photosynthetic pigments of naturally colored cotton genotypes under irrigation with waters of different electrical conductivities and foliar applications of hydrogen peroxide. The design used was randomized blocks in a 4 x 3 x 2 factorial arrangement, corresponding to four concentrations of hydrogen peroxide - H2O2 (0, 25, 50 and 75 mu M), three genotypes of colored fiber cotton ('BRS Rubi, 'BRS Topazio' and 'BRS Verde') and two values of electrical conductivity of water (0.8 and 5.3 dS m(-1)), with three replicates. Irrigation with water of 5.3 dS m(-1) reduces the chlorophyll a, chlorophyll b and total chlorophyll concentrations of 'BRS Rubi' cotton. The concentrations of photosynthetic pigments, maximum fluorescence, variable fluorescence and quantum efficiency of photosystem II of 'BRS Rubi' cotton increased under irrigation with 0.8 dS m(-1) water and foliar application of 50 mu M of hydrogen peroxide. Water of 5.3 dS m(-1) and foliar applications of 75 mu M of hydrogen peroxide reduce the concentrations of photosynthetic pigments, but did not cause damage to the efficiency of photosystem II of the colored cotton genotypes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available