塩ストレス下における野生稲Oryza officinalis Wall ex Wattの乾物生産 および光合成能力

日本作物学会紀事

仲村 一郎¹  ホサイン モハメド アムザド¹  鄭 紹輝³  赤嶺 光¹  西澤 優² 

[1] 琉球大学農学部;鹿児島大学大学院連合農学研究科;佐賀大学農学部

关键词: Dry matter production;    乾物生産;    Na+/K+ ratio;    Na+/K+比;    Photosynthetic rate;    光合成速度;    Salt tolerance;    耐塩性;    Sodium content;    Na+含有率;    Wild Oryza species;    野生稲;   

DOI  :  10.1626/jcs.84.49

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

This experiment was conducted to evaluate the salt tolerance level of the wild Oryza species, Oryza officinalis Wall ex Watt. Dry matter weight, ion content and photosynthetic rate of O. officinalis were compared with those of two salt-sensitive wild specis, O. rufipogon Griff. and O. australiensis Domin, the salt-tolerant cultivar O. sativa L. cv. Pokkali and the salt-tolerant wild species O. latifolia Desv. under a 12 dS m-1 NaCl-stressed condition. O. officinalis and O. latifolia subjected to salt stress had heavier leaf dry matter than Pokkali, and similar leaf water content (%) to that of Pokkali. O. officinalis and O. latifolia had more accumulated Na+ in the leaves than Pokkali. The photosynthetic rate of O. officinalis and O. latifolia was not decreased by a salt-stressed condition as compared with that of Pokkali. The main factor of the decreased photosynthetic rate was stomatal closure in all species. Furthermore, photosynthetic rate of O. rufipogon was related to non-stomatal limitations. Photosynthetic rate showed a positive correlation with stomatal conductance in O. officinalis, but a clear correlation was not found in O. latifolia. These results indicated that the salt tolerance mechanism of O. officinalis was similar to that of O. latifolia. However, the coefficient of correlation between photosynthetic rate and stomatal conductance showed a difference between O. officinalis and O. latifolia in the response of photosynthetic rate to salinity stress.

【 授权许可】

Unknown