金腰箭依赖于种子二型性的跨世代效应促进胁迫耐受力分异

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中文摘要：植物的跨世代效应对物种适应可预测和不可预测环境具有相反的作用.种子二型性植物能产生具有不同适应性策略的二型性子代,但是亲本是否会对种子二型性子代的胁迫适应性进行差异性跨世代调控尚不清楚.本研究旨在探索来自二型性种子的母株是否传递给二型性种子子代不同的跨世代效应,以及是如何传递的.研究物种金腰箭(Synedrella nodiflora)能够适应较广水分梯度,同时产生两种不同类型的种子(较轻的中心花种子和较重的边花种子).通过两个世代的同质园种植实验,我们检验了亲代干旱胁迫对子代生长表现和死亡率的跨世代效应是否依赖于亲代和子代植株初始的种子形态,并测定了母株对种子的物质资助、化学调控物质传递和其他相关繁殖过程的指标,以探索其潜在的调控机制.研究结果显示,跨世代效应同时依赖于亲代和子代植株初始的种子形态.干旱胁迫下,由边花种子长成的母株提高其边花种子相对于中心花种子的比例,并向萌发自边花种子的子代传递更强的跨世代效应,而由中心花种子长成的母株表现出完全相反的规律.子代表现的跨世代效应与种子内脱落酸和可溶性糖含量变化密切相关,但与亲代对种子的物质资助不相关.依赖于种子二型性的跨世代效应能使子代的干旱胁迫耐受力出现较大分化,这可能是解释种子二型性物种平衡种群维持和种群扩张的新机制.

外文标题：Dimorphism-dependent transgenerational effects facilitate divergence of drought tolerance in Synedrella nodiflora

外文摘要：Transgenerational effects in plants incur opposing effects on the adaptation to predictable vs.unpredictable environments.While seed-dimorphic plants can produce dimorphic offspring with different adaptive strategies,it remains unclear whether the transgenerational effects and seed dimorphism may interact to dictate offspring adaptation.This study aimed to explore whether and how seed-dimorphic maternal plants impart different transgenerational effects to dimorphic offspring.Synedrella nodiflora was chosen as a study species,which is adaptive to a wide soil water gradient and produces two distinctive types of seeds(light disc vs.heavy ray seeds).In a greenhouse,S.nodiflora was grown for two generations under drought stress to test whether the transgenerational effects on offspring performance and mortality depend on maternal(MS)or offspring seed morph(OS).The potential regulatory mechanisms were explored by measuring seed provisioning and chemical regulators of maternal plants and related reproductive processes.The transgenerational effects depended on both MS and OS.Drought stress induced the maternal plants originated from ray seeds to increase the relative proportion of ray-vs.disc-seed offspring and transmit stronger adaptive transgenerational effects to the former,whereas its effects on the maternal plants originated from disc seeds were exactly opposite.These different effects on offspring corresponded with different seed abscisic acid and soluble sugar contents but not seed provisioning.Dimorphism-dependent transgenerational effects allow large divergence of drought tolerance among offspring,which may be an important but under-explored mechanism to balance the needs of population maintenance and range expansion in seed-dimorphic species.

外文关键词：

droughtpopulationreproductionseed dimorphismseed provisioningSynedrella nodifloratrans-generational effects

作者：

Qian Gan、Jingyu Liu、Huixuan Liao、Shaolin Peng

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作者单位：

State Key Laboratory of Biocontrol,School of Life Sciences,Sun Yat-sen University,Guangzhou 510275,China

School of Ecology,Sun Yat-sen University,Guangzhou 510275,China

关键词：

干旱种群繁殖种子二型性种子投资金腰箭(Synedrella nodiflora) 跨世代效应

基金：

National Natural Science Foundation of ChinaVegegraphy of ChinaZhang Hongda Science FoundationFu Jia-Rui Scholarship of Sun Yatsen University

项目编号：

NSFC 320715302015FY210200-13

出版年：

2023

DOI：

10.1093/jpe/rtac042

植物生态学报(英文版)

CSCD

ISSN：1752-9921

年,卷(期)：2023.16(1)

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