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CROP BREEDING, GENETICS & CYTOLOGY

Temperature and Photoperiod Effects on Sterility in a Cytoplasmic Male-Sterile Soybean

^a Dep. of Botany and Bessey Microscopy Facility, Iowa State Univ., Ames, IA 50011-1020
^b USDA-ARS, CICG Research Unit and Dep. of Agronomy and Zoology/Genetics, Iowa State University, Ames, IA 50011-1010

* Corresponding author (hth{at}iastate.edu)

Manual cross-pollination to produce large quantities of hybrid soybean seed is difficult and time consuming. An environmentally stable sterility system is one of the necessary components to produce large quantities of hybrid seed. The objective of this study was to subject cytoplasmic male-sterile (CMS) BC5F1 plants, from a cross of a Chinese Glycine max wild-type soybean with a Chinese wild annual soybean G. soja (male parent) and controls, to a variety of different temperature and photoperiod treatments to test whether CMS is stable under various environmental conditions. Plants were grown in growth chambers under controlled temperature, photoperiod, and irradiance regimes until pod set, and then they were transferred to a glasshouse until they matured. Plants were evaluated for time of anthesis after photoperiod induction (13 h light/11 h dark) and fertility or sterility. Anther squash and pod set data showed that sterility of the CMS line was stable under all environmental conditions tested, whereas fertility-restored control plants remained fertile. Extreme environmental conditions led to delayed floral induction and/or stunted growth.

Abbreviations: BPR, basic photoperiod regime • BTR, basic temperature regime • CMS, cytoplasmic male-sterile

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				M. B. Smith, R. G. Palmer, and H. T. Horner Microscopy of a cytoplasmic male-sterile soybean from an interspecific cross between Glycine max and G. soja (Leguminosae) Am. J. Botany, March 1, 2002; 89(3): 417 - 426. [Abstract] [Full Text] [PDF]