不同水分处理对甜椒穴盘老化苗形成的影响

Effects of Different Water Treatments on Formation of Ageing Pepper Seedlings

为明确甜椒穴盘苗发生老化的基质含水量,并通过苗期的形态指标的变化来识别老化苗。在日光温室内,以甜椒王作为供试作物,50孔穴盘为供试穴盘,试验设定5个不同水分处理,分别为50%(T1)、60%(T2)、70%(T3)、80%(T4)、90%(T5)。2叶1心开始处理,6叶1心测定植株的形态指标和生理指标。不同水分处理可以改变植株体内木质素的含量,T1、T2、T3、T5木质素较T4高,并且均达到差异显著性水平。MDA引起膜脂过氧化,造成甜椒穴盘苗老化。T4的MDA含量较T1、T2、T3、T5分别降低了50.59%,47.06%,14.26%,9.31%。而T4的净光合速率较T1、T2、T3、T5分别增高了58.85%,51.21%,41.84%,24.79%。T4的壮苗指标均高于其它处理。基质供水量为80%Q时,辣椒穴盘苗抗老化能力最强,幼苗生长旺盛。

This study was to make sure the stroma liquid water content in pepper seedling ageing,and to discern ageing seedlings by the changes in shape indexes.The experiment was carried out in the sunlight greenhouse.The experimental material was ＂Sweet Pepper＂ and the number of experimental holes was 50.The experiment designed five different water treatments.They were 50%（T1）,60%（T2）,70%（T3）,80%（T4） and 90%（T5）,respectively.The treatmeats began at the stage of two leaves and one heart,and the shape indexes and physical indexed were surveyed at the stage of six leaves and one heart.Different water treatments changed the lignin content.In the different water treatments,the ageing of pepper seedlings started from the bottom of the stem.The lignin contents of T1,T2,T3 and T5 were higher than those of T4 and the differences were significant.MDA caused plasma lemma peroxide thus bringing about pepper plug ageing.MDA content of T4 was lower than that of T1,T2,T3 and T5 by 50.59%,47.06%,14.26% and 9.31% respectively.But PIR was higher than that of T1,T2,T3 and T5 by 58.85%,51.21%,41.84% and 24.79% respectively.The strong seedling indexes of T4 were obvious higher than in other treatments.When the supplying water was 80% Q,the pepper plug seedlings had a strong anti-ageing ability and the seedling grew very well.