Variation in pollen viability in the onion (Allium cepa L.)

Ockendon, D. J.; Gates, Phil

doi:10.1007/bf00041615

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…In some anthers, occasional production of fertile pollen in male‐sterile lines was observed which could be due to the high temperature effects on pollen production. Other authors (Meer and Bennekom , Ockendon and Gates) reported variation for pollen viability among flowers from same plant. Sen and Srivastava () were first to use male sterility from exotic sources, and other male‐sterile lines have been developed by other Indian researchers.…”

Section: Discussionmentioning

confidence: 95%

Limitations of PCR‐based molecular markers to identify male‐sterile and maintainer plants from Indian onion (Allium cepa L.) populations

Khar

Saini

2016

Plant Breeding

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The main aim of this study was to validate PCR markers for determining cytoplasm and genotypes at the Ms locus in short-day onion. Three cytoplasmic (OSN, MKFR and accD) and four nuclear (OPT, jnurf13, AcSKP1 and AcPMS1) markers were employed. Sel. 121-1 had 100% S cytoplasm, whereas Sel. 121-2, 'Pusa Red' and 'Pusa Madhavi' had 88%, 33% and 17% S cytoplasm, respectively. 'Early Grano' and 'Pusa Riddhi' did not possess S cytoplasm. Observations in 33 commercial varieties revealed two with sterile (S) cytoplasm. Nuclear markers were not found in linkage disequilibrium with the Ms locus, and the constitution of Ms alleles by OPT was different from other three markers, which were in conformity with each other. The other three markers predicted that most of the plants should be homozygous recessive. Anther colour also did not confirm the sterility status. It can be concluded that accD may be used for cytoplasm determination based on the ease of its use. For the Ms locus tagging, more markers are needed to be evaluated to isolate maintainer lines from open-pollinated populations.

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Section: Discussionmentioning

confidence: 95%

Limitations of PCR‐based molecular markers to identify male‐sterile and maintainer plants from Indian onion (Allium cepa L.) populations

Khar

Saini

2016

Plant Breeding

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“…This variation among male-fertility-restored plants may be due to genetic background or environmental factors such as high temperatures at critical times of flower development (Barham and Munger, 1950;Meer and Bennekom, 1969). Ockendon and Gates (1976) reported variation for pollen viability among flowers from the same plant. In Beta vulgaris ssp.…”

Section: Resultsmentioning

confidence: 99%

The Dominant Ms Allele in Onion Shows Reduced Penetrance

Melgar¹,

Havey²

2010

J. Amer. Soc. Hort. Sci.

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The most commonly used source of cytoplasmic male sterility in onion (Allium cepa) is controlled by the interaction of the cytoplasm [male-sterile (S) or normal male-fertile (N)] and one nuclear male-fertility-restoration locus (Ms). Scoring of genotypes at Ms is generally done by testcrossing male-fertile to male-sterile (S msms) plants, followed by scoring of testcross progenies for male-fertility restoration. We identified two N-cytoplasmic families, one that was homozygous dominant and the other segregating at Ms. Plants from each of these two families were individually testcrossed to male-sterile onion. Nuclear restoration of male fertility in testcross progenies was evaluated in the field over 4 years. For male plants homozygous dominant at Ms, we expected testcross families to show 100% male-fertility restoration, but observed mean values between 46% and 100%. For plants segregating at Ms, we again observed lower than expected frequencies of male-fertility restoration. These results demonstrate that the dominant Ms allele shows reduced penetrance, requiring that male-fertility restoration be scored over years to more confidently assign genotypes at Ms.

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“…Pollen viability in onion has been shown to vary, even down to anther level, though high viability is more commonly found than low (OCKENDON & GATES, 1976). Pollen viability differences might explain some of the results from the mixed pollinations, though the use of many anthers in a mixture would tend to even out viability differences within umbels.…”

Section: Discussionmentioning

confidence: 99%

Pollen competition in onion (Allium cepa L.)

Currah¹

1981

Euphytica

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Variation in pollen viability in the onion (Allium cepa L.)

Cited by 7 publications

References 9 publications

Limitations of PCR‐based molecular markers to identify male‐sterile and maintainer plants from Indian onion (Allium cepa L.) populations

Limitations of PCR‐based molecular markers to identify male‐sterile and maintainer plants from Indian onion (Allium cepa L.) populations

The Dominant Ms Allele in Onion Shows Reduced Penetrance

Pollen competition in onion (Allium cepa L.)

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