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在小麦(Triticum aestivum Linn.)孕穗期对农林46群体×宁麦3号重组自交系群体(RIL)进行淹水处理,研究了淹水胁迫对小麦株高、绿色叶片数等形态性状和对蒸腾速率、光合速率等生理指标的影响以及不同株系的耐湿性差异。结果表明,孕穗期过湿处理使株高、主茎绿色叶片数、蒸腾速率和光合速率都显著下降。通过方差分析发现RIL群体各自交系在主茎绿叶数湿害指数、株高湿害指数、蒸腾速率湿害指数和净光合速率湿害指数等4项指标均存在极显著差异。遗传参数估算结果表明,遗传变异系数(GCV)大小顺序为:株高湿指(24.4%)>光合速率湿指(20.3%)>蒸腾速率湿指(15.4%)>主茎绿叶数湿指(6.9%);广义遗传力(h2B)次序为:蒸腾速率湿指((50.4±7.1)%)>株高湿指((46.0±7.5)%)>光合速率湿指((43.2±7.8)%)>主茎绿叶数湿指((29.3±8.7)%)。相关分析显示蒸腾速率湿害指数与光合速率湿害指数之间存在极显著的正相关(r=0.721)。根据4个性状的湿害指数从群体中筛选出一批耐湿性较好的自交系。
At the booting stage of wheat (Triticum aestivum Linn.), The recombinant inbred line population (RIL) of Agro-forestry 46 × Ningmai 3 was flooded, and the effects of waterlogging stress on plant height, number of green leaves, Transpiration rate, photosynthetic rate and other physiological indicators as well as different strains of moisture resistance differences. The results showed that the plant height, green leaf number, transpiration rate and photosynthetic rate of bryophyte decreased significantly at booting stage. The results of analysis of variance showed that there were significant differences among the four indexes of RIL population’s inbred lines in the main stem green leaf number wet injury index, plant height and wet injury index, transpiration rate wet injury index and net photosynthetic rate wet injury index. The results of genetic parameter estimation showed that the order of GCV was as follows: plant height wet index (24.4%)> photosynthetic rate wet index (20.3%)> transpiration rate wet index (15.4% 6.92%). The order of generalized heritability (h2B) was: transpiration rate (50.4 ± 7.1)%) )> Main stem green leaves wet index ((29.3 ± 8.7)%). Correlation analysis showed that there was a significant positive correlation (r = 0.721) between transpiration rate and wet injury index of photosynthesis rate. According to the wet trapping index of four traits, some inbred lines with better moisture-tolerance were selected from the population.