Paper Details

Exogenous  abscisic  acid  enhances  sugar  accumulation  in  rice (Oryza sativa L.) under salinity

Saeed Saeedipour

DOI: https://dx.doi.org/10.12692/ijb/4.10.249-257

Int. J. Biosci. 4(10), 249-257. May, 2014. (PDF)

Abstract:

Sugar, a final product of photosynthesis, is reported to be involved in the defense mechanisms of plants against abiotic stresses such as salinity. The objective of this study was to determine the effects of exogenous ABA on carbohydrate metabolism in rice.We present here the comparative protective potentiality of exogenously applied abscisic acid (ABA) in mitigating NaCl toxicity and inducing short-term salinity tolerance in two indica rice varieties, namely IR29 (salt-sensitive) and FL485 (salt-tolerant). Salt stress may promote sugar accumulation, a high level of sugar were found in salt-tolerant rice. Meanwhile, the results indicated that exogenous abscisic acid can improve sugar accumulation under salinity. Increased glucose at the initial, and fructose at the end of experiment were observed in the flag leaf of both cultivars under salinity and to more extent by application of exogenous of ABA to unstressed plant. Salinity stress induced an accumulation of starch in cv. FL485. It is suggested that partitioning sugars into starch may involve in salinity tolerance by avoiding metabolic alteration.