摘要
以强筋(郑麦9023)、中筋(新麦13)和弱筋(豫麦50)型小麦品种为试材,测定了它们非叶光合器官的叶绿素含量、荧光动力学参数、净光合速率及对籽粒的贡献率.结果显示,不同品质类型小麦非叶光合器官叶绿素含量表现为旗叶鞘>穗下节间>芒>穗部颖片,各非叶光合器官开花18d后叶绿素含量均表现为弱筋小麦>中筋小麦>强筋小麦;弱筋小麦的非叶光合器官在灌浆前期具有较高的Fv/Fm、ΦPSⅡ值,在灌浆后期其Fv/Fm和ΦPSⅡ值下降幅度显著小于强筋小麦并有较高的净光合速率;非叶光合器官对籽粒的相对贡献率依次为穗部>旗叶>节鞘,且对弱筋小麦籽粒的贡献率高于中筋和强筋小麦,其中节鞘和穗对弱筋小麦粒重的相对贡献率分别为15.7%和35.4%.研究表明,弱筋小麦豫麦50的非叶光合器官能维持较较强的光合能力,生产更多的光合产物,花后形成的光合产物对其粒重的增加起重要作用.
Net photosynthetic rates, chlorophyll fluorescence characteristic and their contribution to grains of winter wheat （Triticum aestivum L. ） cultivars with different quality type,‘ Zhengmai 9023 ＇, ‘Xinmai 13＇ and ‘Yumai 50＇, were measured to study the differences in photosynthetic and fluorescence characteristics of non-leaf organs. The chlorophyll contents of non-leaf photosynthetic organs in all three different quality wheat cultivars showed the order of sheath in flag leaf〉internode under spike〉awn〉glume in spike. The order of the chlorophyll contents in the same organs of different cuhivars were ‘Yumai 50＇〉‘ Xinmai 13＇ 〉‘ Zhengmai 9023 ＇ after anthesis 18 days Fv/Fm and qbPS Ⅱ of non-leaf photosynthetic organ of ‘Yumai 50＇ were higher than that of another two cultivars at early grain filling stage and the decline extent of Fv/Fm and RbPS Ⅱ at later grain filling stage was significantly less than that of‘ Zhengmai 9023＇, ‘Yumai 50＇ also had higher net photosynthetic rate at the same time. The result indicated that non-leaf photosynthetic organ of‘Yumai 50＇ was able to maintain higher photosynthesis capability and produce more photosynthesis output. The relative contribution rate to grain for different photosynthesis organ showed the order of spike〉flag leaf〉internode and sheath. The same rule was found that contribution to grain of ＇Yumai 50＇ was higher than that of another two cultivars in non-leaf photosynthetic organ. The relative contribution rate of spike and sheath of ‘Yumai 50＇ to grains was 15.7% and 35.4% ,respectively.The results indicated that non-leaf photosynthetic organ of cultivar ‘Yumai 50＇ had higher photosynthetic ability and photosynthetic output. They played important role for increasing grain weight.
出处
《西北植物学报》
CAS
CSCD
北大核心
2008年第7期1448-1454,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家科技部国家粮食科技丰产工程(2004BA520A-06)
关键词
小麦
非叶光合器官
光合荧光特性
光合贡献率
wheat
non-leaf photosynthetic organ
photosynthetic and fluorescence characteristics
contribution rate of photosynthesis
