冬小麦不同衰老类型生理特性的差异──小麦衰老特性研究之一

DIFFERENCE OF PHYSIOLOGICAL CHARICTERISTICS OF DISTINCT TYPES OF SENESCENCE IN WINTER.WHEAT--Studies on Senscent Characteristics in Wheat(I)

通过三种不同衰老类型冬小麦品种的比较研究表明，早衰品种的绿色叶面积持续期最短，叶片中的叶绿素含量、含氟量及光合速率和根系活力都较早的下降与丧失，各项生理参数的平均水平均低于正常衰老品种；青枯衰老品种的绿色对面积、叶绿素含量及光合性能持续期在参试品种中均为最长，但参数平均水平均为最低。表现为内部变化低下平缓，不能正常进入衰老阶段；正常衰老品种有较长的绿叶面积持续期，在收获期正好进入黄熟期，不早衰，不贪青，各项生理变化协调性好，数量与质量水平均较高。

Through a comparative study that conducted with three different senscenttypes of winter wheat varieties,the main results are summarized:that compared withboth the normal senscent wheat types and the early type of senscence had a shorter durationof the green leaf area,the content of chlorophyll and nitrogen,the photosynthetic rate andthe root vigour were declined and lost,the average level of all physiolbgical indexes was lower. The green-deing senscent type had a longer duration of the green leaf area.The chlorophyll content and the photosynthesis were longer than the normal type,but the average levelof all physological indexes were the lowest in all the types,and the phisiological changewas low and gentle.The type cannot enter senscent phase normally.The normal senscenttype had a higher level for all indexes both quantity and quality.This type can enter senscentphase normally. The coordination among all indexes was better than other types.