Abstract Taking 2 pepper nuclear male sterile lines‘GMSDS-702A’and‘GMSDS-702B’as
experimental material，this paper conducted investigation on their main agronomic traits，and measured the
contents of relevant physiological indicators at different development stages of flower buds．The results showed
that the vegetative growth of sterile line plant was relatively vigorous．The plant height and spread width were
significantly higher than that of the fertile line．The anthers of the sterile line were shriveled，with browned
surface，the tissue structure was hardened，and the anthers were tightly closed and could not form normal
pollen grains．The contents of soluble sugar，soluble protein，free proline，and malondialdehyde were all
different with various degrees at different development stages．At the stage of microspore mother cell，the
contents of soluble sugar and free proline in sterile lines were reduced by a big margin，and the content of
malondialdehyde was at a higher level．Those of，fertile lines were on the contrary．It might have a certain
inner link with the abortion of microspore．
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Received: 28 November 2019
Published: 20 February 2020
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