期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 75, 期 -, 页码 74-82出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2011.08.006
关键词
Environment; Dormancy; Chilling; Heat; Seed; Juglans regia
资金
- University of Tehran
- Iran National Science Foundation (INSF)
Stratification, chilling, and heat requirements for both seeds and buds of five Persian walnut genotypes were compared. In experiments carried out between November 2006 and March 2008, 1-year-old twigs were collected after leaf-fall, placed in plastic bags, and kept at 4 +/- 1 degrees C to provide chilling periods ranging from 400 to 1500 h. After chilling, twigs were transferred to a greenhouse for determination of chilling requirement and the number of growing degree hours (degrees C) needed for bud break. For germination experiments, mature seeds were stratified at 4 +/- 1 degrees C for treatment periods ranging from 0 to 8 weeks and then grown in a greenhouse under natural conditions. Germination rate and time to radicle emergence were recorded weekly and seedling heights were recorded after 2 months growth. Results indicated genotypes could be classified into three dormancy groups based on their chilling and heat requirements: low ('Ronde de Montignac' and 'Serr'), medium ('Z(53)'), and high ('Lara' and 'Z(63)') dormancy. Stratification for 6-8 weeks was most appropriate to overcome walnut seed dormancy, to obtain the best germination percentage and germination rate, and to prevent physiological dwarfing. A relationship between the chilling and heat requirements for bud-break and the stratification requirement for germination of seeds was observed and data showed that the nutshell is a mechanical barrier to germination in walnut seeds with intermediate physiological dormancy. (C) 2011 Elsevier B.V. All rights reserved.
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