Gynodioecious behaviour in some walnut genotypes-a new report

Sharma, O. P.; Singh, DB; Zahoor, S.; Padder, BA; Haji, SA

doi:10.5958/2230-7338.2016.00035.5

Cited by 2 publications

(3 citation statements)

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“…Our observations showed that J. regia contained four flowering morphs: protandrous, protogynous, female and male. Both monoecious and unisexual morphs have also been reported in other studies of heterodichogamous species, including J. regia (Dommée, Bompar, & Denelle, ; Sato, ; Sharma, Singh, Zahoor, Padder, & Haji, ). Unlike previous reports of Juglans (Bai, Zeng, Liao, & Zhang, ; Gleeson, ; Kimura, Seiwa, Suyama, & Ueno, ), the ratio of protandrous to protogynous morphs was biased towards the protandrous morph and the frequency of female morphs was very high in our study population.…”

Section: Discussionsupporting

confidence: 69%

“…Distance‐ or density‐dependent pollination success or fruit and seed set are further hypothesized to differ between cosexuals and females (Friedman & Barrett, ; Hesse & Pannell, ) because self‐compatible cosexual individuals can self‐fertilize their progeny via geitonogamous pollination on the same plant, whereas female individuals cannot. Therefore, when a population of a heterodichogamous species contains both monoecious and female individuals, as has been reported in several studies (Dommée, Bompar, & Denelle, ; Kimura, Seiwa, Suyama, & Ueno, ; Sato, ; Sharma, Singh, Zahoor, Padder, & Haji, ), the patterns of distance‐dependent fruit set are expected to differ between monoecious and female plants.…”

Section: Introductionmentioning

confidence: 72%

“…The gynoecium has a single ovule and two feathery stigmas, so fruit set is equivalent to seed set. It is a heterodichogamous species, but unisexual individuals are often observed (Sharma, Singh, Zahoor, Padder, & Haji, ).…”

Section: Methodsmentioning

confidence: 99%

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Gender specialization and factors affecting fruit set of the wind‐pollinated heterodichogamous Juglans regia

Cao

Liu

et al. 2020

Plant Species Biology

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Gender expression, flowering phenology, reproductive performance and factors affecting fruit set (i.e., flowering synchrony, size and distance to the nearest pollen donor) were investigated in a cultivated population of a windpollinated self-compatible heterodichogamous Juglans regia (Juglandaceae). Four flowering morphs, (i.e., protandrous, protogynous, male and female) were observed. The sexual functions of the protandrous and protogynous morphs were almost synchronous; however, they were not reciprocal, and the separation of male and female flowering within most monoecious individuals was not complete. Thus, within-morph mating and geitonogamous pollination may be common. The ratio of protandrous versus protogynous morphs was biased towards the protandrous morph, but the fruit set did not differ between the morphs, suggesting that the fruit set of the protandrous morph could be partly compensated by within-morph pollination. The ratio of the female flower number or fruit number to the total male catkin length was higher in the protogynous morph than in the protandrous morph and did not vary with plant size, suggesting that gender variation was not size dependent and that the sexual function of protandrous morphs was more male biased. Fruit set depended on plant size only for protandrous morphs. The fruit set of individual plants decreased with increasing distance to the nearest pollen donor regardless of morph, possibly because of pollen limitation. The fruit set of individual plants increased with flowering synchrony, indicating that flowering synchrony could affect reproductive success. K E Y W O R D Sflowering synchrony, fruit set, heterodichogamy, Juglans regia, wind-pollination

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