金钟藤种子低萌发率原因探讨

程汉亭1; $21*; $22; $21; $21; $21; $21

引用本文:	程汉亭1，范志伟1*，李鸣光2，黄乔乔1，李晓霞1，沈奕德1，刘丽珍1.金钟藤种子低萌发率原因探讨[J].广西植物,2012,(4):522-526.[点击复制]
	CHENG Han Ting1， FAN Zhi Wei1*， LI Ming Guang2， HUANG Qiao Qiao1， LI Xiao Xia1， SHEN Yi De1， LIU Li Zhen1.Probing the cause of the low germination rate of Merremia boisiana seed[J].Guihaia,2012,(4):522-526.[点击复制]

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金钟藤种子低萌发率原因探讨
程汉亭1，范志伟1*，李鸣光2，黄乔乔1，李晓霞1，沈奕德1，刘丽珍1
1.中国热带农业科学院环境与植物保护研究所/农业部热带作物有害生物综合治理重点实验室/海南省热带农业有害生物检测监控重点实验室/海南省热带作物病虫害生物防治工程技术研究中心（筹）， 海南儋州 571737;2.中山大学有害生物控制与资源利用国家重点实验室，广州 510275

摘要:

金钟藤种子在室内萌发率很低，为进一步探讨金钟藤种子的特性，阐明其种子萌发率低的主要原因，对金钟藤种皮的透水性、种子解剖结构、种子活力和种子内源抑制物的生物测定进行了研究。结果表明：金钟藤种皮透水性较差，完整种子比破皮种子吸水达到最高水平慢38 h；种子空瘪粒多，占所有种子的30%；种子活力较低，平均活力仅为35%；金钟藤种子甲醇粗提液对白菜种子萌发率、根长和芽长均有较强的抑制作用，其浸提液浓度在25 mg/mL时，严重抑制白菜种子萌发和生长，即金钟藤种子内部含有较高的内源抑制物质。金钟藤种子萌发率低，表明其近年来突发性蔓延成灾主要不是由种子生成新个体造成的，导致其蔓延成灾的关键因素还需要进一步深入研究。

关键词: 藤本植物种皮透水性种子活力种子内源抑制物萌发率

DOI：

分类号:Q945.34

基金项目:

Probing the cause of the low germination rate of Merremia boisiana seed

CHENG HanTing1， FAN ZhiWei1*， LI MingGuang2， HUANG QiaoQiao1， LI XiaoXia1， SHEN YiDe1， LIU LiZhen1

1.Institute of Environment and Plant Protection， CATAS/Key Laboratory of Integrated Pest Management for Tropical Crops， Ministry of Agriculture/Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests/Hainan Engineering Research Center for Biological Control of Tropical Crops Diseases and Insect Pests，Danzhou 571737， China;2.State Key Laboratory of Biocontrol of Sun YatSen University， Guangzhou 510275， China

Abstract:

To find out the reasons for its indoor low germination rate，the permeability of seed coat，seed anatomical structure，seed vigor and seed endogenesis inhibitors were examined. The results showed that the permeability of seed coat was poor. Chipped seeds reached the highest value of water absorption in less than 38 h as the intact seeds. The proportion of empty seeds was as high as 30%. Seed vigor was low and averaged at 35%. The germinability，shoot and root growth of cabbage seeds were significantly inhibited by methanol extracts of M.boisiana seeds. When methanol extracts of seeds reached a concentration of 25 mg/mL，germination and growth of cabbage seeds were seriously inhibited，suggesting rather high content of endogenesis inhibitors in M.boisiana seeds. Low germination rate of M.boisiana seeds indicated that seed's generation of a new plant was not the main reason for the outburst overspread disaster in the recent years, and the key factors should be further researched.

Key words: liana seed coat permeability seed vigor seed endogenesis inhibitor germination