Relationship of Sword Leaf Morphology and Transpiration Characteristic at Booting Stage with Salt Tolerance

doi:10.3969/j.issn.1000-7091.2012.06.018

Abstract

Abstract: The objective of our study was making clear the salt tolerance mechanism during booting stage and providing theoretical basis for selecting the salt tolerant index． 6 rice varieties were used as experimental materials． Salt stress was performed under field growth condition for irrigating water solution prepared with NaCl． Sword leaves were sampled at booting stage to analyze the uptaking rule of Na⁺,K⁺,Ca²⁺and morphology and transpiration characteristic， the relationship between salt tolerance and them was also analyzed． The result showed that the salt tolerance of 6 varieties were Longdao 5 >Changbai 10 >Songjing 12 >Dongnong 425 >Mudanjiang 26 >Mudanjiang 30 in order based on the salt tolerance coefficient． Na⁺content in rice was increased，K⁺content decreased after salt stress． For salt tolerant varieties， the accumulation of Na⁺in aerial part was less than in root，K⁺in aerial part was more and having no obvious difference in root． Ca²⁺concentrated mainly in root and had no obvious variance for salt tolerant varieties after salt stress，but decreased obviously for sensitive varieties． The difference of sword leaf length， sword leaf width and sword leaf area between treatment and control were significant and very significant，and the damage of sword leaf for salt tolerant varieties was slight． The sword leaf of some varieties tend to curl after stress and some tend to unfold from curling， the curling dimension of salt tolerant varieties was less that of salt sensitive varieties． Chlorophyll content degraded gradually following with the decreasing of variety' s salt tolerance，had the significant or very significant difference． Salt tolerant varieties had the high transpiration rate and stomatal conduct ance after salt stress，but canopy temperature stepped up following with the decreasing of variety's salt tolerance． The relative value of K⁺content in aerial part， sword leaf's width，canopy temperature，Na⁺content in root，Ca²⁺ content in root， sword leaf area and transpiration efficiency during booting stage could be the index for rice salt tolerance screening and identification．

Key words: Rice, Booting stage, Salt stress, Salt tolerance

CLC Number:

S511.01

SUN Jian, ZHAO Hong-wei, WANG Jing-guo, LIU Hua-long, XIE Dong-wei, LIU Zhong-liang, GUO Li-ying, ZOU De-tang. Relationship of Sword Leaf Morphology and Transpiration Characteristic at Booting Stage with Salt Tolerance[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(6): 84-91. doi: 10.3969/j.issn.1000-7091.2012.06.018.

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