Study on pollen viability and stigma receptivity throughout the flowering period in the selected taxa of the Gesneriaceae family

IF 2.2 4区 农林科学 Q2 HORTICULTURE Folia Horticulturae Pub Date : 2023-03-30 DOI:10.2478/fhort-2023-0009
Françoise Baptiste, Jong-Yi Fang
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Abstract

ABSTRACT Plants in the Gesneriaceae family are appreciated for their decorative leaves and flowers, ease of cultivation, and shade tolerance. Sexual hybridisation has long been carried out for producing novel hybrids. However, scientific knowledge is lacking on the correct timing of pollination in this family. This study was conducted to elucidate the optimal timing for pollination by screening pollen viability and stigma receptivity throughout the flowering period in eight gesneriad taxa. Pollen viability was evaluated by the in vitro germination test and stigma receptivity was based on stigma morphology and pistil length. The flowering duration varied from 10 days in Alsobia to 18 days in Streptocarpus. While the pollens of Episcia, Kohleria, Saintpaulia, Sinningia, and Smithiantha had totally lost viability 2–5 days before the flowers withered, a slightly contrasting situation was observed in the cases of Alsobia, Deinostigma, and Streptocarpus, where a small portion of pollen grains remained viable towards the end of the flowering period. The highest pollen germination rate was recorded from 1 day in Alsobia, Episcia, and Kohleria, to 9 days in Deinostigma. The reduction in pollen germination was rapid in Alsobia, Saintpaulia, and Smithiantha, and moderate in the remaining taxa. The greatest pollen tube growth occurred at 1–3 days after flower opening and decreased rapidly in all the taxa tested. The longest pistil of 2.03–3.50 cm was observed at 3–8 days of anthesis depending on the plant tested. The findings in this study suggest that higher pollination success may be achieved using pollen grains of newly opened flowers and stigmas of mature flowers in this family.
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苦苣苔科植物花期花粉活力和柱头接受性的研究
苦苣苔科植物因其具有装饰性的叶和花、易于栽培和耐阴性而受到人们的重视。长期以来,人们一直通过有性杂交来产生新的杂交种。然而,关于这个科的正确授粉时间缺乏科学知识。本研究通过筛选8个属类群的花粉活力和柱头可受性来确定最佳授粉时机。通过离体萌发试验评价花粉活力,通过柱头形态和雌蕊长度评价柱头接受度。花期从10天到18天不等。Episcia、Kohleria、Saintpaulia、Sinningia和Smithiantha的花粉在花凋谢前2-5天就完全失去了活力,而Alsobia、deino柱头和Streptocarpus的情况则略有不同,在花期结束时,仍有一小部分花粉颗粒保持活力。花粉发芽率最高的品种为黑柱头属、黑柱头属和黑柱头属,发芽率最高的品种为1 d ~ 9 d。阿索比亚、圣保利亚和史密斯亚塔的花粉萌发率下降较快,其余分类群的花粉萌发率下降较缓。各类群花粉管生长在开花后1 ~ 3 d达到高峰,并迅速下降。不同植物在开花后3 ~ 8天雌蕊最长,为2.03 ~ 3.50 cm。本研究结果表明,利用该科新开花的花粉粒和成熟花的柱头可以获得更高的授粉成功率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Folia Horticulturae
Folia Horticulturae Agricultural and Biological Sciences-Horticulture
CiteScore
3.40
自引率
0.00%
发文量
13
审稿时长
16 weeks
期刊介绍: Folia Horticulturae is an international, scientific journal published in English. It covers a broad research spectrum of aspects related to horticultural science that are of interest to a wide scientific community and have an impact on progress in both basic and applied research carried out with the use of horticultural crops and their products. The journal’s aim is to disseminate recent findings and serve as a forum for presenting views as well as for discussing important problems and prospects of modern horticulture, particularly in relation to sustainable production of high yield and quality of horticultural products, including their impact on human health.
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