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以易空秆和不易空秆的成对近等基因系沈农98A、沈农98B和易发生空秆的玉米杂交种D90、不易发生空秆的品种郑单958为试材,在田间种植条件下,通过人工遮荫方法进行不同强度的光照胁迫处理,研究不同耐阴性材料雌穗幼穗分化对光胁迫的反应差异。结果表明,不同耐阴性材料在遮荫胁迫下雌穗幼穗发育均受到很大影响,但不同耐阴性材料之间差异很大。易空秆的杂交种及自交系在轻度胁迫下,D90幼穗长度减少38.2%,结穗率减少17.0个百分点;沈农98A幼穗长度减少35.8%,结穗率降低78.7个百分点。与杂交种相比,自交系的反应更为敏感,在38%遮荫胁迫下,沈农98A与沈农98B的幼穗长、结穗率、穗行数、行粒数和败育率产生明显差异;郑单958与D90在60%遮荫胁迫下幼穗长和结穗率差异开始明显,其他性状在75%遮荫胁迫下才有明显区别。
In this study, Shennong 98A, Shennong 98B, and maize hybrids D90 with empty stalk, which were notable for empty stalk, were used as test materials, Under different shades of illumination, artificial shade method was used to study the response of spikelet differentiation of different negative-tolerance materials to light stress. The results showed that different shade-tolerant materials had a great influence on the spikelet development of young ear under shade stress, but the difference between different shade-tolerant materials was very large. Under moderate stress, the ear length of D90 decreased by 38.2% and the rate of node formation decreased by 17.0%. The length of young panicle of Shennong 98A decreased by 35.8% and the rate of node panicle decreased by 78.7%. Compared with hybrids, inbred lines were more sensitive. Under 38% shade stress, the panicle length, panicle number, ear number, grain number and abortion rate of Shennong 98A and Shennong 98B The differences of the ear length and the ear diameter between Zhengdan 958 and D90 under the 60% shade stress began to be obvious. The other characters were obviously different under the 75% shade stress.