Physiological performance of synthetic hexaploid wheat-derived populations
Physiological performance of synthetic hexaploid wheat-derived populations
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DOI：
10.2135/cropsci2000.4051257x
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发表时间：
2000-09-01
期刊：
影响因子：
2.3
通讯作者：
Reynolds, MP
中科院分区：
文献类型：
--
作者：
del Blanco, IA;Rajaram, S;Reynolds, MP
据报道，普通小麦（Triticum aestivum L.）的野生祖先比现代小麦品种具有更高的最大光合速率。四倍体小麦与黄叶菊杂交获得的合成六倍体。已被证明是抵抗或耐受生物和非生物胁迫的有用来源。本研究旨在确定人工合成的六倍体是否也有助于提高叶片光合速率和其他生理性状的遗传多样性。在墨西哥索诺拉市奥布雷贡市（Ciudad Obregon）附近的西北农业研究中心（INIFAP）实验站对BC2F2:6合成衍生品系的三个不同群体进行了评估。各基因型间最大光合速率存在差异。一些合成衍生系的光合速率高于它们的循环亲本。以衰老和生理成熟之间的天数来确定的青期，大多数合成来源系与复发亲本没有区别。最大光合速率与叶面积呈负相关，与气孔导度、叶肉导度和叶温降度呈正相关。叶肉导度占最大光合速率变化的85%。这些结果表明，合成小麦也可能是重要生理性状遗传多样性的来源，如提高光合速率。
Wild ancestors of common wheat (Triticum aestivum L.) have been reported to have higher maximum photosynthetic rates than modern wheat cultivars. Synthetic hexaploids, obtained by crossing tetraploid wheat and Aegilops tauschii Coss., have proven useful as a source of resistance or tolerance to biotic and abiotic stresses. This study was conducted to determine whether synthetic hexaploids also could contribute genetic diversity to enhance leaf photosynthetic rate and other physiological traits. Three different populations of BC2F2:6 synthetic-derived lines were evaluated at the Agricultural Research Center for the Northwest (INIFAP) Experimental Station, near Ciudad Obregon, Sonora, Mexico. Differences in maximum photosynthetic rate were detected among genotypes. Several synthetic-derived lines showed higher photosynthetic rates than their recurrent parent. Staygreen, determined as days between senescence and physiological maturity, of most synthetic-derived lines did not differ from the recurrent parents. Maximum photosynthetic rate was negatively associated with leaf area and positively associated with stomatal and mesophyll conductances, and leaf temperature depression. Mesophyll conductance accounted for 85% of the variation in maximum photosynthetic rate. These results suggest that synthetic-derived wheat can be also a source of genetic diversity for important physiological traits such as enhanced photosynthetic rate.