Reproductive Assurance through Autogamous Self-pollination across Diverse Sexual and Breeding Systems

Shivanna, K. R.

doi:10.18520/cs/v109/i7/1255-1263

Cited by 29 publications

(9 citation statements)

References 90 publications

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“…Pollination failure acts as a selection pressure and often drives plants to evolve effective methods to achieve some seed set as a means of 'reproductive assurance' (Shivanna 2015). Self-compatible species resort to self-pollination to ameliorate the effects of pollination uncertainty despite the risks of inbreeding depression (Barrett 2002, Knight et al 2005, Ramírez and Davenport 2013.…”

Section: Introductionmentioning

confidence: 99%

Pollination biology and breeding system analysis of Ulmus wallichiana Planchon (Ulmaceae), a rare and threatened tree species of Central and Western Himalaya

Roy

Khanduri²,

Bhatnagar

et al. 2021

Nordic Journal of Botany

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Understanding the constraints on sexual reproduction of a plant species are important for predicting stability of the species in its natural habitat. In the absence of such data, any conservation efforts are arbitrary and remain ineffective. We investigated the reproductive ecology and breeding system of a rare and threatened tree species of central and western Himalaya, Ulmus wallichiana. The phenology, floral biology and pollination mechanism were observed in two populations for three consecutive years. In addition, breeding system and pollen limitation were examined using hand‐pollination experiments. Flowering in U. wallichiana begins in early March during which trees are leafless and small, pinkish‐white flowers cover the entire tree. Pollination is accomplished exclusively by wind with short average distances for pollen dispersal (~50 m). Pollination manipulation experiments showed high fruit set on outcrossing indicating U. wallichiana is xenogamous. However, a small percent of fruit set in autogamous and geitonogamous treatments indicates partial self‐incompatibility. Fruit set augmented when pollen was supplemented indicating that natural fruit set in U. wallichiana is limited due to unavailability of adequate pollen. Thus, it can be concluded that reproductive success of U. wallichiana is compromised due to scarcity of conspecifics and partial SI may partly ensure reproductive assurance in the low pollen exchange environment. The present study emphasizes on establishment of minimum population size with optimum distance between trees for effective conservation interventions.

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Section: Introductionmentioning

confidence: 99%

Pollination biology and breeding system analysis of Ulmus wallichiana Planchon (Ulmaceae), a rare and threatened tree species of Central and Western Himalaya

Roy

Khanduri²,

Bhatnagar

et al. 2021

Nordic Journal of Botany

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“…The low rate of self-compatibility observed in D. rotundata suggests that there are prezygotic and/or postzygotic barriers directed against autogamy. Plants have evolved a number of devices to limit autogamy [47]. In yam, autogamy is naturally limited by the development of unisexual flowers and the delay between the male and female flowering [43].…”

Section: Discussionmentioning

confidence: 99%

“…Details of the different crosses are presented in Table 2. It has to be mentioned that strict autogamy (pollen coming from the same flower) is not possible in unisexual flowers and that what we consider in this paper as autogamy is in fact geitonogamy (pollen coming from other flowers of the same plant) [47]. For bagged intraindividual self-pollination, mixed inflorescences (bearing both male and female flowers) or close male and female inflorescences of a same plant (Figure 1A) were bagged together with a mesh to avoid insect pollination (Figure 1B).…”

Section: Self and Cross Pollination Crossingsmentioning

confidence: 99%

Yam (Dioscorea rotundata Poir.) Displays Prezygotic and Postzygotic Barriers to Prevent Autogamy in Monoecious Cultivars

Denadi

Yolou

Dadonougbo³

et al. 2022

Agronomy

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Cultivated yam (D. rotundata) is a staple tuber crop in West Africa whose sexual reproduction control remains largely unknown despite its importance for plant breeding programs. In this paper, we compared self-pollination, intracultivar cross-pollination and intercultivar cross-pollination in three monoecious cultivars (Amoula, Heapala and Yassi). Results showed that pollen viability (49%) and stigma receptivity (40%) were similar in monoecious and dioecious plants, suggesting that autogamy could occur in monoecious plants. However, fruit and seed sets were significantly lower after self-pollination compared to cross-pollination. Overall, autogamy reached 11% and pollen lability was almost zero (<1%). The low percentage of pollen grains germinating on the stigma (37%) and pollen tubes reaching the ovules (25%) after self-pollination partly explained the low seed set. Strong inbreeding depression was observed after self-pollination and almost all fruits and about 75% of the seeds resulting from self-pollination showed malformations. Seed germination was also 20 times lower after self-pollination compared to cross-pollination. Sexual reproduction remained low in D. rotundata even after cross-pollination as fruit and seed set did not exceed 18% and 13% respectively. Moreover, comparison between intracultivar cross-pollination and self-pollination revealed intravarietal genetic diversity inside the analyzed yam cultivars. Overall, our results showed that D. rotundata has a very low tolerance to autogamy in monoecious cultivars and has developed pre- and postzygotic mechanisms to limit selfing.

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“…One of the interesting field observations that an isolated patch of female plants can also set fruits gregariously, led to a detailed investigation which established that the species is a facultative apomict (Mangla et al, 2015). Such a condition serves as mean of reproductive assurance (Shivanna 2015a).…”

Section: B a Delhi University Contributions To Pollen Biology 15mentioning

confidence: 99%

Developmental biology of dispersed pollen grains

Shivanna

Tandon²

2020

Int. J. Dev. Biol.

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Professor Panchanan Maheshwari served as Professor and Head of the Department of Botany, University of Delhi, from 1950 to 1966 and built an internationally reputed School of integrated plant embryology. Studies carried out during and after Maheshwari’s period from this School have enormously advanced our knowledge of the structural, developmental and functional aspects of embryological processes. This review covers studies carried out at the Delhi School on the developmental biology of dispersed pollen grains which operate from pollen dispersal from the anthers until pollen tubes discharge the male gametes in the embryo sac for fertilization. These events include pollen viability and vigour, pollen germination and pollen tube growth, structural details of the pistil relevant to pollen function, pollination and pollen-pistil interaction.

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Reproductive Assurance through Autogamous Self-pollination across Diverse Sexual and Breeding Systems

Cited by 29 publications

References 90 publications

Pollination biology and breeding system analysis of Ulmus wallichiana Planchon (Ulmaceae), a rare and threatened tree species of Central and Western Himalaya

Pollination biology and breeding system analysis of Ulmus wallichiana Planchon (Ulmaceae), a rare and threatened tree species of Central and Western Himalaya

Yam (Dioscorea rotundata Poir.) Displays Prezygotic and Postzygotic Barriers to Prevent Autogamy in Monoecious Cultivars

Developmental biology of dispersed pollen grains

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