*通讯录作者：E-mail:jinjuanf@hotmail.com
收稿日期: 2015-06-10
修回日期: 2015-09-16
网络出版日期: 2015-11-10
基金资助
国家自然科学基金资助项目(31371857)
Photosynthetic Characteristics and Sucrose Metabolism of Rice Flag Leaf with Different Stomatal Densities
*Corresponding author：E-mail:jinjuanf@hotmail.com
Received date: 2015-06-10
Revised date: 2015-09-16
Online published: 2015-11-10
单提波, 姚文钧, 徐正进, 樊金娟, 武静莲 . 不同气孔密度水稻剑叶光合特性及蔗糖代谢研究[J]. 中国水稻科学, 2015 , 29(6) : 648 -652 . DOI: 10.3969/j.issn.1001G7216.2015.06.011
Three rice lines with different leaf stomatal densities(high, medium and low) were used to study photosynthetic characteristics, sucrose content and the activities of sucrose metabolizing enzymes in flag leaf at full heading stage. The results showed that the content of sucrose and the activity of sucrose phosphate synthase (SPS) in rice flag leaves were extremely significantly and positively correlated with stomatal density, and the activity of sucrose synthase (SS) was significantly positively correlated with stomatal density. Rubisco activity,net photosynthetic rate,sucrose content,SPS and SS in rice leaves with high stomatal density were significantly higher than those in rice leaves with low stomatal density, while negatively correlated with the activity of neutral invertase (NI). These results showed that increased stomatal density improved the photosynthetic efficiency, the sucrose accumulation and the activities of SPS and SS, which contributed to photosynthate(sucrose) transport to grains.
Key words： rice; leaf; stomatal density; sucrose metabolism
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