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Photoperiod Shift Effects on Yield Characteristics of Rice
Author(s) -
Volk Gayle M.,
Mitchell Cary A.
Publication year - 1995
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1995.0011183x003500060019x
Subject(s) - biology , panicle , cultivar , agronomy , canopy , oryza sativa , biomass (ecology) , crop , greenhouse , photoperiodism , yield (engineering) , upland rice , cropping system , horticulture , botany , materials science , metallurgy , gene , biochemistry
Edible yield must be maximized for each crop species selected for inclusion in the Controlled Ecological Life‐Support System (CELSS) proposed by NASA to support long‐term manned space missions. In a greenhouse study aimed at increasing biomass partitioning to rice ( Oryza sativa L.) grain, plants of the high yielding semi‐dwarf rice cultivar Ai‐Nan‐Tsao were started in pots under 8‐h photoperiods at a density of 212 plants m −2 . After different periods of time under 8‐h photoperiods, pots were switched to continuous light for the remainder of the cropping cycle. Continuous light did not delay time to first panicle emergence (60 d) or time to harvest (83 d). There was a positive correlation between the length of continuous light treatments and nongrain biomass. Grain yield (1.6 ± 0.2 g plant −1 ) did not increase in continuous light. Yield‐efficiency rate (grain weight per length of cropping cycle, canopy volume, and weight of nongrain shoot biomass) was used to compare treatments. Small Ai‐Nan‐Tsao rice canopies grown under 8‐h photoperiods were more efficient producers of grain than canopies grown under continuous light for a portion of the rice cropping cycle.