Rice yield reduction due to water limitation depends on its severity and duration and on the phenological stage of its occurrence. We exposed three contrasting rice genotypes, IR64, UPLRi7 and Apo(adapted to lowland, upland and aerobic conditions, respectively), to three water regimes(puddle, 100% and 60% field capacity) in pots during the vegetative(GSI), flowering(GSII) and grain filling(GSIII) stages. Stress at all the three stages significantly reduced yield especially in lowland genotype IR...

【文章頁(yè)數(shù)】：12 頁(yè)

【文章目錄】：
MATERIALS AND METHODS
    Plant growth and stress conditions
    Relative water content
    Gas exchange
    Soil and plant analyzer develotrnent(SPAD)value
    Morpho-physiological parameters
    Yield parameters
    Statistical analysis
RESULTS
    Effect of stress at GSI(vegetative stage)
    Stress response at GSII(flowering stage)
    Stress effect at GSIII
    Responses of spikelet fertility to stress at three stages
    Aerobic cultivar Apo had higher water extraction ability under stress
    Source to sink imbalance was the major contributor for yield loss at any given stage
DISCUSSION
    Stress at any phenological stage reduces plant productivity
    Increasing root length assists to maintain tissue turgor
    Reduced spikelet fertility is the determining factor for reduced yield in all phenological stages
    Reduction in source availability will influence yield
SUPPLEMENTAL DATA



本文編號(hào)：3953517