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ARS Home » Midwest Area » Ames, Iowa » Corn Insects and Crop Genetics Research » Research » Publications at this Location » Publication #92184
Title: A DEVELOPMENTAL MICROSCOPIC STUDY OF A CHINESE WILD-TYPE SOYBEAN LINE EXHIBITING MALE STERILITY

Author
item SMITH, MARIANNE - IOWA STATE UNIVERSITY
item HORNER, HARRY - IOWA STATE UNIVERSITY
item Palmer, Reid

Submitted to: Botanical Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/18/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: It is the purpose of this study to microscopically investigate the developmental sequence leading to male sterility, and to demarcate the temporal and spatial parameters that result in degeneration of the male cells. The first irregularities in development are discernible after the microspore tetrads have been released from the encasing callose, between the early and late microspore stages. A succession of events, whose precise origin has yet to be identified, occurs: instead of disintegrating timely, the tapetum may persist and press against the microspores or, contrarily, it may degenerate prematurely and the tapetal cytoplasm may be found dispersed throughout the locule. At the same time the middle and/or parietal layer(s) may enlarge grossly. Progressively, darkly staining, granular material from the tapetum and/or middle and parietal wall layers amasses in the locule or the wall layers. The material may be present as a adark layer encircling the tapetum, or it may be found dispersed in the locule and throughout the four wall layers. After microspore mitosis, the pollen does not engorge with reserves but remains highly vacuolated, and becomes collapsed and aborted at anthesis.