干旱条件下小麦冠层温度及其性状的关联研究

Relationships between canopy temperature and biological characters of wheat under drought conditions.

通过对小麦冠层温度和有关性状的长期观测,发现自然界存在冠层温度持续偏低的小麦,在干旱条件下,它的叶片功能期、叶绿素含量、蒸腾速率、净光合速率、可溶性蛋白含量和超氧化物歧化酶活性等重要性状明显优于冠层温度持续偏高的小麦品种,且丙二醛(MDA)积累速度慢,在籽粒灌浆期表现尤为明显。冷型小麦表现出干旱胁迫下仍然具有代谢功能较好、活力旺盛和抗早衰能力较强的特征,这进一步拓展了冷型小麦的应用范围,对于加速适应于干旱条件的优良品种选育并将其推向生产具有十分重要的意义。

Based on the long-term observation of canopy temperature and biological characters of wheat,we discovered a kind of cold type wheat that can maintain a low canopy temperature.Under drought condition,its canopy temperature was continuously lower than that of control,especially during milk-filling stage.Many of its biological characters,such as chlorophyll content,net photosynthetic rate,soluble protein content and SOD activity etc,were superior to those of warm type wheat,which make it grow more efficiently under drought condition.The discovery is very important to the variety selection and is useful to improve wheat yield and quality in dry farmlands.