Effect of timing and severity of water deficit on four diverse rice cultivars II. Physiological responses to soil water deficit

Lilley J.M. and Fukai S. (1994) Effect of timing and severity of water deficit on four diverse rice cultivars II. Physiological responses to soil water deficit. Field Crops Research, 37 3: 215-223. doi:10.1016/0378-4290(94)90100-7


Author Lilley J.M.
Fukai S.
Title Effect of timing and severity of water deficit on four diverse rice cultivars II. Physiological responses to soil water deficit
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 1994-01-01
Sub-type Article (original research)
DOI 10.1016/0378-4290(94)90100-7
Open Access Status Not yet assessed
Volume 37
Issue 3
Start page 215
End page 223
Total pages 9
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Rice shows significant genotypic variation in physiological response to water deficit. This work examines whether this variation is due to genotypic differences in water extraction capability. Leaf elongation rate, leaf rolling, leaf death, and predawn leaf water potential were studied for four rice (Oryza sativa L.) cultivars during water deficit imposed either before panicle initiation (vegetative-stress), or after panicle initiation (reproductive-stress). The four rice cultivars chosen, CPIC8, Lemont, Rikuto-Norin 12 (RN), and Todoroki-Wase (TW), were known to have differing responses to water deficit when grown under upland conditions. Paper I of this series showed differences in rooting pattern and soil water extraction. The cultivar differences in water extraction resulted in differing rates of development of stress. Cultivar RN had poor water extraction and was most sensitive to water deficit, with most rapid decline in leaf elongation, most rapid leaf rolling, and greatest leaf death. TW also had poor water extraction but plants were small and this cultivar escaped severe stress, particularly in the vegetative phase. CPIC8 and Lemont extracted more soil water and were less sensitive to water deficit. After accounting for differences in water extraction ability, cultivar differences in sensitivity of physiological processes to water deficit were small. Leaf elongation rate was more sensitive to water deficit than leaf rolling while pre-dawn leaf water potential, measured after overnight recovery of water status, declined only after those processes almost ceased. Duration of physiological activity was determined to a large extent by the ability of the cultivars to extract water from deep soil layers. Greater extraction prolonged physiological activity and therefore crop growth. This characteristics could be particularly important in an environment where several short periods of water deficit occur.
Keyword Drought tolerance
Leaf elongation rate
Leaf rolling
Rice
Water stress
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 28 Jun 2016, 15:52:42 EST by System User