Endopeptidase BAPA from sterile line at trinucleate stage showed cysteine - and serine types and also part of type with metalloprotease but it was the serine type only in maintainer line .

不育系 三 核期含有的BAPA内肽酶包括半胱氨酸型、丝氨酸型，以及部分含金属酶类；

The ZR content varied with different genotypes in the leaves while in the spikes and anthers it was higher than CK from mononucleate to trinucleate stage ;

叶片中ZR含量变化随着基因型不同而有差异，而在幼穗与花药中，在花药败育的关键时期，即单核期至 三 核 期ZR含量 都高于对照；

However aminopeptidase in maintainer line at trinucleate pollen stage belonged mainly to the cysteine type .

而在 三 核 期，保持系的氨肽酶 则主要为半胱氨酸型。