Physiology and productivity of rice crop influenced by drought stress induced at different developmental stages
Year: 2011
Type: article
Abstract: -6 M) prior to sowing. Foliar application of ABA (10 -6 M) was made at tillering stage, 40 days after sowing (40 DAS) in both cultivars. Drought stress was induced at panicle initiation (PI) (65 DAS) and soft dough (SD) (105 DAS) stages with re-watering at incipient wilting (12% soil moisture). Drought induced significant decrease in endogenous level of IAA, GA, sugar and protein contents in leaves at SD stage, while ABA and proline contents increased significantly as compared to control. In grains, drought induced decreases in IAA, sugar and protein content were greater at PI stage in both cultivars. Stomatal resistance was significantly increased in flag and penultimate leaves at PI stage. ABA treatments ameliorated the adverse effects of drought stress for most of the physiological parameters but were ineffective to restore the drought-induced decrease in GA content. On-rewatering, the recovery of prestressed plants was significantly enhanced under ABA seed soaking and foliar spray treatments as compared to drought alone. It is inferred that the mechanism of ABA-induced tolerance to drought stress appears to be involved in maintenance of water budget by decreasing GA, increasing stomatal resistance and by osmoregulation as observed by increase in proline accumulation, and enhanced grain filling to bring early maturity in rice over control.
Source: AFRICAN JOURNAL OF BIOTECHNOLOGY
DOI: 10.5897/ajb09.1261
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2152971063