PJB-2008-185
QUANTIFICATION OF PHYSIOLOGICAL AND BIOCHEMICAL CHANGES IN RICE DUE TO PLANTING MODES
ABID MAJEED AND ASGHARI BANO
Abstract
The objectives of the research project were to evaluate the effect of planting modes based on varying moisture levels on the growth and yield of two lowland rice cultivars viz. KS-282 (coarse cultivar) and BAS-385 (fine cultivar) under natural conditions at three successive stages (viz. tillering, soft dough and mature grain stages) of grain filling. The two cultivars were grown in two different planting modes i.e. beds and flat fields at Kala Shah Kaku (KSK), Lahore. The endogenous level of growth promoting hormones Gibberellic Acid (GA) and Indole Acetic Acid (IAA) as well as sugar and protein content of leaves and grain increased at tillering and soft dough stages but decreased at mature grain stage. The magnitude of increase was more in flat field (FF) as compared to raised beds (RB) in both the cultivars. The stomatal resistance of flag and penultimate leaves was higher in flat field as compared to raised beds at tillering stage in both the cultivars. Root length, weight and plant height was significantly higher in BAS-385 as compared to KS-282 under both planting modes. It was concluded that difference in the moisture availability significantly affected the physiology of plants leading to higher yield in FF planting modes as compared to RB. The endogenous level of plant hormones (IAA and GA) affected the translocation of assimilates. KS-282 cultivar performed better with respect to yield. However, leaves and grains of BAS-385 contained more sugar and protein content than KS-282.
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