干旱区生态环境知识资源中心(Arid): 野榆钱菠菜三种异型种子幼苗的生长特性

Arid

	野榆钱菠菜三种异型种子幼苗的生长特性
其他题名	Investigation of growth characteristics of seedlings from three types of heteromorphic seeds of Atriplex aucheri
	马赫 1; 魏岩 2; 穆晨 3
来源期刊	草业学报
ISSN	1004-5759
出版年	2018
卷号	27 期号:3 页码:126-134
中文摘要	野榆钱菠菜是新疆重要的荒漠野生牧草资源,具有褐色(非休眠类型)、黑色大、黑色小(休眠类型)3种异型种子。以种子异型性植物野榆钱菠菜为材料,对3种异型种子在自然条件下进行培育,对比观察研究3种异型种子的萌发物候及幼苗的生长特性。结果表明:1)异型种子萌发物候不同步,萌发策略不同,褐色种子集中萌发,出苗率为74.30%,萌发期为3 d;两种黑色种子萌发期长,分散萌发,出苗率分别为6.58% (黑色大种子)和1.55% (黑色小种子),萌发期分别为21和17 d。2)异型种子子叶存留时间长,但存留时间有差异,种子越小子叶存留时间越短。3)褐色种子幼苗在初期其子叶长宽、根长、地上地下生物量均显著大于黑色种子幼苗,但随着幼苗的生长,3种异型种子幼苗在这些指标方面的差异逐渐缩小。4)异型种子幼苗具有不同的生物量分配策略,褐色种子幼苗主要将养分输送到地上部分,两种黑色种子幼苗主要将养分输送到地下部分,这种不同的生物量分配策略能够使种子异型性植物在面对荒漠异质环境时具有不同的应对方式,是种子异型性植物能够长期适应荒漠异质环境的重要生态适应机制。研究结果为揭示种子异型性植物长期适应荒漠异质环境提供新的科学依据,也为两头下注对策理论提供新的理论基础。
英文摘要	Atriplex aucheri is an important wild forage germplasm resource in Xinjiang desert regions. It exhibits seed heteromorphism, with 3 types of seed produced: brown seeds (non-dormant) , large black and small black seeds (dormant). Seeds from a single A. aucheri plant (grown from one particular seed type) were used as experimental material. The three types of seeds were cultivated under natural conditions,and comparative studies of germination phenology and growth characteristics of three types of seeds carried out. It was found that : 1) The germination phenology of heteromorphic seeds were unsynchronized, and different types of seeds had different germination strategies. The germination of brown seeds was rapid with an emergence rate of up to 74.30% within 3 days. The germination of the other two types was delayed with emergence rates of 6.58% and 1.55%,after 21 and 17 days, respectively,for large and small black. 2) The cotyledons of all three types of seeds were retained for an extended time during germination, but the retention time varied with the seed size. The smaller the seeds were,the shorter the cotyledon retention time. 3) The cotyledon size, root length, and above- and below-ground biomass of brown seeds were all significantly greater than those of the two types of black seeds in the early growth stages,but as seedlings developed,the size differences between plants from different seed types decreased gradually. 4) The seedlings from different types of seed displayed different biomass allocation strategies. Seedlings grown from brown seeds showed comparatively greater development of the above-ground organs, while the two types of black seeds prioritized below-ground development. Seed hetero-morphism therefore provides different seedling survival strategies (rapid establishment after occasional rain or stress tolerance in less favourable conditions). This seed heteromorphism is an important ecological adaptive mechanism for plants growing in the hash desert environment. This study provides novel insight into the ecological significance of seed heteromorphism in this desert environment and also provides a basis for a new theoretical theory of ecological bet-hedging.
中文关键词	野榆钱菠菜 ; 种子异型性 ; 萌发物候 ; 幼苗
英文关键词	Atriplex aucheri seed heteromorphism germination phenology seedling
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6195993
来源机构	新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237347
作者单位	1.新疆维吾尔自治区草原总站;;新疆农业大学草业与环境科学学院, ;;新疆草地资源与生态重点实验室, 乌鲁木齐;;乌鲁木齐, 新疆;;新疆 830049;;830052, 中国; 2.新疆农业大学草业与环境科学学院, 新疆草地资源与生态重点实验室, 乌鲁木齐, 新疆 830052, 中国; 3.新疆维吾尔自治区草原总站, 乌鲁木齐, 新疆 830049, 中国
推荐引用方式 GB/T 7714	马赫,魏岩,穆晨. 野榆钱菠菜三种异型种子幼苗的生长特性[J]. 新疆农业大学,2018,27(3):126-134.
APA	马赫,魏岩,&穆晨.(2018).野榆钱菠菜三种异型种子幼苗的生长特性.草业学报,27(3),126-134.
MLA	马赫,et al."野榆钱菠菜三种异型种子幼苗的生长特性".草业学报 27.3(2018):126-134.