Embryology of early abortion due to limited maternal resources in Pisum sativum L

C. L. Briggs*, M. Westoby, P. M. Selkirk, R. J. Oldfield

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In most flowering plants, many embryos are aborted early in their development due to limited maternal resources. The kin-conflict interpretation of plant embryology predicts these abortions should be under maternal control. In a study of the abortion process in Pisum sativum, we found the first visible indication of abortion was formation of a weak hypostase. Callose was locally deposited around the chalazal endosperm haustorium, and lignin along the outer cell walls of the remnant nucellar tissue. The nucellus was compressed by proliferating adjacent inner integumental cells. The endosperm haustorium's cytoplasm was forced back into the embryo sac cavity. With suppression of haustorial activity the endosperm nuclei gradually enlarged followed by enlargement of the embryo and suspensor nuclei.Finally, nuclei and cytoplasm throughout the endosperm and embryo lost stainability and broke down. Four successive stages were recognized in seed abortion. In seeds developing to maturity, no hypostase was developed and the haustorium continued to digest both the remnant nucellus and the proliferated inner integumental cells. These observations are consistent with the kin-conflict hypothesis.

Original languageEnglish
Pages (from-to)611-619
Number of pages9
JournalAnnals of Botany
Volume59
Issue number6
DOIs
Publication statusPublished - Jun 1987

Keywords

  • garden pea
  • histology
  • hypostase
  • kin-conflict hypothesis
  • ovule abortion
  • pisum sativum

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