Abortion occurs during double fertilization and ovule development in Paeonia ludlowii

Paeonia ludlowii (Stern & Taylor) D.Y.Hong, an endangered species, is indigenous to Tibet, China and propagated only by seed under natural conditions. Its natural reproduction is constrained by low fecundity. Excess seed abortion is a key factor restricting its natural reproduction, cultivation,...

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Published in:Journal of plant research Vol. 135; no. 2; pp. 295 - 310
Main Authors: Chen, Tingqiao, Xie, Mengyu, Jiang, Yumeng, Yuan, Tao
Format: Journal Article
Language:English
Published: Singapore Springer Singapore 01.03.2022
Springer Nature B.V
Subjects:
Abortion
Biomedical and Life Sciences
China
embryo sac
Embryos
Endangered species
Endosperm
Fecundity
Fertilization
Flowering
Indigenous species
Life Sciences
Offspring
Ovaries
Ovule
Ovules
Paeonia
pistil
Plant Biochemistry
Plant Ecology
Plant Physiology
Plant reproduction
Plant reproductive structures
Plant Sciences
Pollination
progeny
Regular Paper – Genetics/Developmental Biology
Ripening
Sectioning
seed abortion
seed development
Seeds
China
Tree peony
Double fertilization
Seed abortion
Endosperm abortion
Ovule
Paeonia ludlowii
ISSN:0918-9440, 1618-0860, 1618-0860
Online Access:Get full text
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Summary:Paeonia ludlowii (Stern & Taylor) D.Y.Hong, an endangered species, is indigenous to Tibet, China and propagated only by seed under natural conditions. Its natural reproduction is constrained by low fecundity. Excess seed abortion is a key factor restricting its natural reproduction, cultivation, introduction, and protection. Understanding the specific origin and occurrence of aborted ovules is important for the protection of offspring. Using serial sectioning analysis, we studied the process of pollination and fertilization of P. ludlowii and examined the characteristics of aborted ovules, developmental differences after flowering of normal and aborted ovules, and their ratios at different positions in P. ludlowii ovaries. During pollination, fertilization, and seed development, ovule abortion was frequent, with a random abortion position. There were three types of abortion, namely, abnormal pistil, sterile ovules, and embryo and endosperm abortions. Of these, embryo and endosperm abortions could be divided into early abortion and middle abortion. The early aborted ovules stopped growing on day 12, the endoblast and endosperm in the embryo sac aborted gradually. Furthermore, the shape of the embryo sac cavity changed. The volume of aborted ovules was significantly different from that of fertile ovules. At ripening, the external morphology of different types of aborted seeds was significantly different. The possible reasons for the abortion of the ovules are also discussed.
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ISSN:0918-9440
1618-0860
1618-0860
DOI:10.1007/s10265-021-01366-5