잠시만 기다려 주세요. 로딩중입니다.

Effects of NaCl stress on germination, antioxidant responses, and proline content in two rice cultivars

한국식물학회지 2005년 48권 2호 p.201 ~ 208
 ( Sohn Young-Geol ) - RDA NHRI Namhae Substation

 ( Lee Byung-Hyun ) - Gyeongsang National University Division of Applied Life Sciences
강규영 ( Kang Kyu-Young ) - Gyeongsang National University Division of Applied Life Science
 ( Lee Jeung-Joo ) - Gyeongsang National University Research Institute of Life Science Division of Plant Resources and Environment

Abstract


We investigated the physiological and biochemical bases for salt tolerance in two rice (Oryza sativa L.) cultivars ? relatively salt-tolerant ‘Dongjin’ and salt-sensitive ‘Kumnam’. Salinized hydroponic cultures were studied at the germination and seedling stages. NaCI inhibited germination more severely in ‘Kumnam’ than in ‘Dongjin’. Increasing the salt concentration also deterred growth to a larger extent in the former. Moreover, the leaves of ‘Kumnam’ exhibited greater increases in lipid peroxidation and Na+ accumulation than those of ‘Dongjin’ under stress. The activities of constitutive and salt-induced superoxide dismutase (SOD, EC 1.15.1.1) and ascorbate peroxidase (AP, EC 1.11.1.11) were also higher in ‘Kumnam’, while only catalase (CAT, EC 1.11.1.6) activity was slightly higher in stressed plants of ‘Dongjin’. The positive correlation between leaf proline levels and NaCI concentration was more evident in ‘Kumnam’. However, ‘Dongjin’ seeds, which had higher germinability in the presence of NaCI, also contained more proline. These results suggest that the higher salt tolerance in ‘Dongjin’ seedlings could be ascribed to their lower NaCI accumulations in the leaves. This presumably is due to reductions in the uptake or transport rates of saline ions to the shoots from the roots. Finally, we believe that the higher germination rate by ‘Dongjin’ is caused by its higher seed proline content.

키워드

antioxidants; germination; proline; rice cultivars; salt stress
원문 및 링크아웃 정보
 
등재저널 정보