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PLANT PHYSIOLOGY , Vol 109, Issue 4 1151-1158, Copyright © 1995 by American Society of Plant Biologists

GENE REGULATION AND MOLECULAR GENETICS

Cell Ablation Reveals That Expression from the Phaseolin Promoter Is Confined to Embryogenesis and Microsporogenesis

AHM. van der Geest, D. A. Frisch, J. D. Kemp and T. C. Hall
Institute of Developmental and Molecular Biology, Texas A&M University, College Station, Texas 77843-3155 (A.H.M.v.d.G., D.A.F., T.C.H.)

Most previous studies of the [beta]-phaseolin (phas) gene, which encodes the major storage protein in bean (Phaseolus vulgaris L.), have shown its expression to be rigorously confined to the developing seed, both in bean and transgenic tobacco (Nicotiana tabacum L. cv Xanthi) plants. To confirm unequivocally the lack of phas expression in vegetative tissues, we placed the diphtheria toxin A-chain (DT-A) coding region under the control of [beta]-phaseolin promoter sequences. Tobacco plants transgenic for phas/DT-A were phenotypically normal until flowering, when they produced anthers that were externally normal but contained no viable pollen. Microscopic examination of immature anthers revealed a normal tapetum, but the pollen mother cells did not undergo meiosis and subsequently degenerated, resulting in male-sterile plants. This demonstration of phas expression during microsporogenesis was corroborated by the expression of [beta]-glucuronidase in pollen of plants transformed with comparable phas/uidA constructs. Although these findings suggested that similarities in phas expression may exist between seed and pollen maturation, no phas activity could be detected in bean pollen. After fertilization of the DT-A-transformed plants with pollen from wild-type tobacco, 50% of the resulting embryos aborted at the heart stage, defining this as the earliest time for phas expression during embryogenesis.


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