Seed quality and germination performance increase with cross-pollination in members of subtribe Orchidinae (Orchidaceae)

Author:

Bazzicalupo Miriam12,Masullo Ilaria3,Duffy Karl J3,Fay Michael F14ORCID,Calevo Jacopo135ORCID

Affiliation:

1. Jodrell Laboratory, Royal Botanic Gardens , Kew, Richmond, Surrey TW9 3DS , United Kingdom

2. Department of Earth, Environment and Life Sciences (DISTAV), University of Genova , Genova 16132 , Italy

3. Department of Biology, University of Naples Federico II, Complesso Universitario di Monte Sant’Angelo , via Cinthia, Naples 80126 , Italy

4. School of Plant Biology, University of Western Australia , Crawley, WA 6009 , Australia

5. School of Molecular and Life Sciences, Curtin University , Perth, WA 6102 , Australia

Abstract

Abstract Over half of angiosperms have self-incompatibility systems to avoid self-pollination and inbreeding depression. Many members of Orchidaceae are self-compatible, but they may be prone to negative consequences of self-pollination. We investigated the effects of both within-flower (autogamy) and within-plant (geitonogamy) self-pollination, and cross-pollination on fruit set, seed quality, and germination rates in 11 related orchid taxa of subtribe Orchidinae. We hand-pollinated flowers and measured fruit set to estimate pre- and postzygotic barriers. We collected morphometric data on embryos and seeds and calculated the percentage of seeds with embryos and seed viability. We then calculated inbreeding depression values for each treatment for each taxon. Ten taxa produced fruits when self-pollinated, but germination rates and seed size increased with cross-pollination. Higher seed viability was correlated with larger embryos/seeds. However, geitonogamous pollination generally resulted in the lowest seed quality compared with autogamy and cross-pollination, with high values of inbreeding depression being detected. Only seven of the 11 taxa (Anacamptis papilionacea, Himantoglossum adriaticum, Ophrys apifera, Ophrys bertolonii, Orchis patens subsp. brevicornis, Orchis provincialis, and Serapias vomeracea) were confirmed as self-compatible. These results show that cross-pollination improves overall seed quality, and that the assessment of self-compatibility in orchids should be based on postfruiting stages.

Publisher

Oxford University Press (OUP)

Reference78 articles.

1. Mechanisms and evolution of food-deceptive pollination systems in orchids;Ackerman;Lindleyana,1986

2. Beyond the various contrivances by which orchids are pollinated: global patterns in orchid pollination biology;Ackerman;Botanical Journal of the Linnean Society,2023

3. Outcrossing rate and inbreeding depression in two annual monoecious herbs, Begonia hirsuta and B. semiovata;Ågren;Evolution,1993

4. Inbreeding depression in a rare plant, Scabiosa canescens;Andersson;Hereditas,2002

5. Numerical and physical properties of orchid seeds and their biological implications;Arditti;New Phytologist,2000

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3