Study on the response of diploid, tetraploid and hexaploid species of wheat to the elevated CO2
Study on the response of diploid, tetraploid and hexaploid species of wheat to the elevated CO2
复制标题
小麦二倍体、四倍体和六倍体品种对CO2升高的响应研究
DOI：
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发表时间：
2009
影响因子：
3.5
通讯作者：
H. Maini
中科院分区：
文献类型：
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作者：
D. C. Uprety;N. Dwivedi;A. Raj;S. Jaiswal;G. Paswan;V. Jain;H. Maini
利用自由空气CO2浓缩(FACE)装置，比较了普通小麦(六倍体)、硬粒小麦(四倍体)和单粒小麦(二倍体)对CO2浓度升高的响应。结果表明，小麦现代品种(六倍体)在很大程度上受库容量限制。它的单位叶面积的光合作用似乎比普通小麦(二倍体小麦)要少。从二倍体小麦到六倍体小麦，随着倍性水平的提高，叶片大小、粒重和淀粉酶活性增加，光合作用速率显著降低。这些小麦品种对二氧化碳浓度升高的反应不同。CO2浓度升高所导致的较大叶面积、较大籽粒重和38 KDa蛋白条带的存在，通过改变源库比，在提高六倍体小麦产量方面具有加性效应。然而，在二倍体小麦中，这种源库平衡并不是由二氧化碳浓度升高引起的。不断增加的二氧化碳可能会为育种者提供机会，并可能允许他们选择对二氧化碳增加反应更好的品种。
Study was done to compare the response of Triticum aestivum (hexaploid), Triticum durum (tetraploid) and Triticum monococcum (diploid) wheat species to the elevated CO2 using Free Air CO2 Enrichment (FACE) facility. It was demonstrated that the modern cultivar of wheat Triticum aestivum (hexaploid) was largely sink limited. It appeared to have less photosynthesis per unit leaf area than Triticum monococcum (diploid wheat). While leaf size, grain weight and amylase activity increased with the ploidy level from diploid to hexaploid wheat forms, the photosynthetic rate was reduced significantly. These wheat species responded differentially to the elevated CO2. The larger leaf area and greater seed weight and presence of 38 KDa protein band caused by elevated CO2 had additive effect in improving the productivity of hexaploid wheat by changing the source sink ratio. Whereas, such a source sink balance was not induced by elevated CO2 in diploid wheat. The increasing CO2 may present opportunities to breeders and possibly allow them to select for cultivars responsive to the elevated CO2 with better sink potential.