Histological studies on the relationship between the low seed set and abnormal embryo sacs in sweet potato, Ipomoea batatas (L.) Lam.

IF 2 4区 农林科学 Q2 AGRONOMY
Breeding Science Pub Date : 2023-09-01 Epub Date: 2023-09-09 DOI:10.1270/jsbbs.23022
Tatsuro Murata
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Abstract

This study aimed to investigate the relationship between low seed set and abnormal embryo sacs lacking normal female organs, such as one egg cell, two assistant cells, and two polar nuclei, in Ipomoea trifida, which is closely related to sweet potato, and sweet potato cultivars and lines, through histological analysis of their ovaries on flowering day. Ovaries of diploid, tetraploid, and hexaploid lines of I. trifida each had four ovules, except for some hexaploid lines with five or six ovules. Almost all sweet potato cultivars and lines had four ovules per ovary, although some sib-cross lines had two or three ovules. The number of ovules per ovary did not have direct effects on low seed set. The frequency of abnormal embryo sac increased with polyploidy in I. trifida. However, it varied among different sweet potato cultivars and lines. Moreover, the variation in abnormal embryo sacs occurred at an earlier stage of gametogenesis (type A) in the tetraploid and hexaploid plants of I. trifida and sweet potato cultivars and lines. These findings suggest that the high frequency of abnormal embryo sacs is a primary cause of low seed set in sweet potato and that it is closely related to the decline in seed propagation that occurs in the evolution process of sweet potato.

关于甘薯(Ipomoea batatas (L.) Lam)结薯率低与胚囊异常之间关系的组织学研究。
本研究旨在通过对与甘薯亲缘关系密切的三叶苕(Ipomoea trifida)及其甘薯栽培品种和品系在开花日的子房进行组织学分析,研究结实率低与缺乏正常雌性器官(如一个卵细胞、两个辅助细胞和两个极核)的异常胚囊之间的关系。三裂苕的二倍体、四倍体和六倍体品系的子房都有四个胚珠,只有一些六倍体品系有五个或六个胚珠。几乎所有甘薯栽培品种和品系的每个子房都有四个胚珠,但有些兄妹杂交品系只有两个或三个胚珠。每个子房的胚珠数对低结实率没有直接影响。异常胚囊出现的频率随着三裂叶甘薯多倍体的增加而增加。然而,不同甘薯栽培品种和品系的异常胚囊频率不同。此外,在三裂叶甘薯的四倍体和六倍体植株以及甘薯栽培品种和品系中,异常胚囊的变化发生在配子发生的早期阶段(A 型)。这些研究结果表明,异常胚囊的高频率是甘薯结实率低的主要原因,它与甘薯进化过程中出现的种子繁殖率下降密切相关。
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来源期刊
Breeding Science
Breeding Science 农林科学-农艺学
CiteScore
4.90
自引率
4.20%
发文量
37
审稿时长
1.5 months
期刊介绍: Breeding Science is published by the Japanese Society of Breeding. Breeding Science publishes research papers, notes and reviews related to breeding. Research Papers are standard original articles. Notes report new cultivars, breeding lines, germplasms, genetic stocks, mapping populations, database, software, and techniques significant and useful for breeding. Reviews summarize recent and historical events related breeding. Manuscripts should be submitted by corresponding author. Corresponding author must have obtained permission from all authors prior to submission. Correspondence, proofs, and charges of excess page and color figures should be handled by the corresponding author.
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