Effects of the exogenous application of auxin and cytokinin on carbohydrate accumulation in grains of rice under salt stress |
| |
Authors: | Majid Ghorbani Javid Ali Sorooshzadeh Seyed Ali Mohammad Modarres Sanavy Iraj Allahdadi Foad Moradi |
| |
Institution: | (1) Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran;(2) Department of Agronomy and Plant Breeding, College of Abureyhan, University of Tehran, Tehran, Iran;(3) Department of Molecular Physiology, Agricultural Biotechnology Research Institute of Iran, P. O. Box 31535-1897, Karaj, Iran |
| |
Abstract: | Phytohormones, such as auxin and cytokinin, are known to be involved in the regulation of plant responses to salinity stress
and counteract the adverse effect of stress conditions. This work investigated the effects of the exogenous spraying of indole-3-acetic
acid (IAA) and kinetin (KIN) during the reproductive phase on grain yield by examining the 1000-grain weight and filled-grain
percentage as well as the changes in starch, total soluble sugars, sucrose, glucose and fructose concentrations in the grains
of two rice cultivars under salt stress. The results indicated that the applied IAA and KIN led to an increased grain yield,
1000-grain weight and filled-grain percentage for both rice cultivars under salt stress. The storage starch content in the
grain of the salt-sensitive cultivar was more than that in the salt-tolerant cultivar under IAA application compared with
KIN, whereas a decrease in the total soluble sugar content was observed with both IAA and KIN treatments, in comparison to
the non-hormone treatment. Interestingly, this study showed that IAA led to a much higher increase in the sucrose content
in grain, as compared to the KIN. Furthermore, this experiment suggests that glucose and fructose may play important roles
during salt stress because there were clearly higher concentrations of these sugars in the grain of the stressed cultivars
under IAA and KIN application: it appears that their accumulation was the earliest response detected during the grain-filling
period in rice. Finally, this work indicated that an increase in the rice grain yield, 1000-grain weight and filled-grain
percentage are associated with an increase in the contents of starch, sucrose, glucose and fructose in grain caused by the
application of IAA and KIN. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|