Water stress effects on leaf elongation,leaf water potential,transpiration, and nutrient uptake of rice,maize, and soybean |
| |
Authors: | V C Tanguilig E B Yambao J C O’toole S K De Datta |
| |
Institution: | 1. Agronomy Department, The International Rice Research Institute, Los Ba?os, Philippines
|
| |
Abstract: | A pot experiment was conducted in the greenhouse to determine and compare the responses of rice (Oryza sativa L. var, IR 36), maize (Zea mays L. var. DMR-2), and soybean (Glycine max L.] Merr. var. Clark 63) to soil water stress. Leaf elongation, dawn leaf water potential, transpiration rate, and nutrient
uptake in stressed rice declined earlier than in maize and soybean. Maize and soybean, compared with rice, maintained high
dawn leaf water potential for a longer period of water stress before leaf water potential. Nutrient uptake under water stress
conditions was influenced more by the capacity of the roots to absorb nutrients than by transpiration. Transport of nutrients
to the shoots may occur even at reduced transpiration rate It is concluded that the ability of maize and soybean to grow better
than rice under water stress conditions may be due to their ability to maintain turgor as a result of the slow decline in
leaf water potential brought about by low, transpiration rate and continued uptake of nutrient, especially K, which must have
allowed osmotic adjustment to occur. |
| |
Keywords: | leaf elongation rate leaf water potential maize nitrogen nutrient uptake phosphorus potassium rice soybean transpiration rate water stress |
本文献已被 SpringerLink 等数据库收录! |
|