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Title of Journal: Euphytica

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Abbravation: Euphytica

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Springer Netherlands

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DOI

10.1007/978-3-319-14448-1_74

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1573-5060

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Meiotic nondisjunction in resynthesized Emphasis

Authors: Jing Wen Xinhua Zeng Yuanyuan Pu Liping Qi Zaiyun Li Jinxing Tu Chaozhi Ma Jinxiong Shen Tingdong Fu
Publish Date: 2010/01/22
Volume: 173, Issue: 1, Pages: 99-111
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Abstract

Meiotic nondisjunction during microsporegenesis can lead to aneuploid gametes formation and reduced pollen fertility in plants This paper reports the prevalence of meiosis I nondisjunction in a resynthesized Brassica napus AACC 2n = 38 and its use for aneuploid production Meiosis in the amphidiploids was characterized by high frequencies of univalents and multivalents per PMC at diakinesis/metaphase I and notably unbalanced chromosome segregations at anaphase I AI In all the plants observed 1895–443 of PMCs exhibited a segregation of 1820 n − 1n + 1 at AI which was caused by nondisjunction of one bivalent or the distribution of two homologous univalents to the same pole Meiosis proceeded normally after AI then thus led to the formation of viable n − 1 and n + 1 gametes and high pollen fertility of these plants Microspore culture was subsequently carried out using these plants in an attempt to isolate Brassica nullisomics Four nullisomics 2n = 36 two nullihaploids 2n = 18 and one tetrasomic haploid 2n = 20 were identified cytologically and characterized morphologicaly and physiologically Amplified fragment length polymorphism AFLP survey suggested that of the six nullisomics/nullihaploids one nullihaploids lost one Agenome chromosome and the other five lost C genome chromosomes Altogether different Cgenome chromosomes were thought to have been lost in the nullisomics/nullihaploids The mechanisms underlying the meiotic abnormalities and the implications of these B napus nullisomics are discussed

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