水分胁迫对水稻剑叶气孔特性的影响

在水分胁迫下水稻剑叶叶片气孔密度明显增加,气孔的长度、宽度明显减小。水分胁迫下气孔密度增加主要是由于叶面积的减小,气孔的行数有所增加。同时研究还表明,秋光的气孔密度与气孔长度呈显著正相关(r=0.989*),比叶重与气孔长度(r=-0.952*)、气孔宽度(r=-0.971*)均呈显著负相关,但相关性都未达到极显著;其余各性状间相关性不显著。沈农265的气孔密度与气孔长度呈显著正相关(r=0.977*),比叶重与叶面积之间的相关性达显著负相关(r=-0.976*),均未达到极显著相关;其余各性状间相关性不显著。随着水分胁迫程度的增加,秋光和沈农265的游离脯氨酸含量也随之增加。除了CDS处理以外,秋光的游离脯氨酸含量基本上都高于沈农265。结果说明,沈农265的抗旱适应性要好于秋光,但是水分胁迫对秋光与沈农265均有负面影响。

The Effects of Drought Stress on Stomatal Characters of Rice Leaf

The results showed that water stress made stomatal density of flag leaf increase and stomatal length,stomatal width decrease obviously.The reason of stomatal density increased under water stress was the decrease of leaf area,the increase of stomatal rows in each stomatal band.The results also showed that stomatal desity of Akihikari had a positively correlation with the stomatal length.The specific leaf weight was negatively correlated with the stomatal length and stomatal width,but the correlation not significant.The correlation among other physiological characters of rice flag leaf were not markedness.The stomatal density of Shennong 265 was positively correlated with the stomatal length.The specific leaf had a negatively correlation with the leaf area,but the correlation not significant.The correlation among other physiological characters of rice flag leaf were not markedness.With the increase of water stress,dissociative proline concentration of Akihikari and Shennong 265 also increased.Except CDS,dissociative proline concentration of Akihikari was almost higher than that of Shennog 265.The results showed that the water resistance of Shennong 265 was better than that of Akihikari.But the drought stress had negative effect on Akihikari and Shennong 265.