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Response of oats to water deficit part 1 physiological characteristics



Response of oats to water deficit part 1 physiological characteristics



Agronomy Journal 69(3): 357-360



The effects of a water deficit on some physiological processes of spring oats (Avena sativa L. 'Jaycee') were quantified. The plants were subjected to water deficits under a field environment for 9-11 days at the boot stage, at anthesis through early grain formation stage, and at both stages in combination. Relative leaf water content (RLWC) as determined by the relative turgidity method was used as a measure of water deficit. Leaf diffusion resistance (LDR) was monitored using a diffusion porometer. The net photosynthetic rate (NPR) of the oat plants was determined using an IR gas analyzer. Severe water stress at all stages of development studied caused about an 80% decline in NPR. LDR increased with a decrease in RLWC. Stress during boot stage reduced the photosynthetic sensivity of the plants to subsequent stress at the anthesis through early grain formation stage. On rewatering, LDR and RLWC recovered completely within 1-6 days; however, the net photosynthetic rate of plants stressed at the anthesis through grain formation stage showed a more gradual and incomplete recovery than plants stressed at other stages. The plants stressed during boot stage alone, but adequately watered thereafter, exhibited significantly higher NPR than the control plants. Leaf diffusion resistance and net photosynthetic rate of oats show acute sensitivity to plant water deficits. These parameters hold promise as aids in determining permissible water deficit limits and in irrigation scheduling.

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