Some traits of low temperature germplasm wheat under extremely unfavorable weather conditions

Through a long-term observation on the canopy temperature and some traits of wheat the temperature germplasm of wheat was found to result in the wheats having either a high or a low plant temperature. Under normal weather conditions, the wheat having a low temperature germplasm (LTG) demonstrated several advantageous physiologi-cal and agronomic traits than those having a high temperature germplasm (HTG). Under the extremely unfavorableweather conditions, such as rainy weather or severe drought, LTG wheat still could maintain its superiority to HTG wheat in physiological and agronomic traits including leaf functional duration, chlorophyll content, malondialdehyde content, transpiration rate, net photosynthesis rate, root vitality and kernel plumpness. The wide adaptability of LTG wheat to awide range of meteoro-ecological conditions could provide a valuable germplasm in breeding of good strains with broad-spectrum stress resistance.     

灾害性天气下小麦低温种质的性状表现

通过对小麦冠层温度和有关性状的长期观测,发现自然界存在体温持续偏低的低温种质.在正常天气条件下,它的一系列重要内、外性状较对照品种和体温持续偏高的高温种质为优,而在严重连阴雨和干旱等灾害性天气下,它的叶片功能期、叶绿素含量、丙二醛含量、蒸腾速率、净光合速率、根系活力和籽粒饱满指数等重要性状仍能继续保持相对于对照品种和高温种质的优势.低温种质在气象生态条件变幅很大情况下的普适能力,有可能为具有广幅抗逆性品种的选育提供良好的种质基础.