trinucleate

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；

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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；

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SOD activity of both types of sterile lines showed a downtrend from uninucleate stage to trinucleate stage.

2类型不育系SOD活性从单核期到三核期都一直呈下降趋势。

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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。

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Anther endothecium cells are more obvious thicker of the stripe-like than the control group in the binucleate pollen stage and trinucleate pollen stage, and cells' shape more clearer.

花药药室内壁细胞与对照组相比较，其在二核期和三核期条纹状加厚较为明显，细胞形状较清晰。

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