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Dehydration Kinetics of Embryonic Axes from Desiccation-sensitive Seeds:An Assessment of Descriptive Models

Journal of Integrative Plant Biology 2009年第11期51卷 1002-1007页

作者： Tobias M. Ntuli norman w. pammenter School of Biological and Conservation Sciences University of KwaZulu-NatalWestville Campus

The response of desiccation-sensitive plant tissues to dehydration is significantly affected by dehydration conditions, particularly the rate of drying. Consequently it is important to be able to quantify drying rate. The aim of the study w.s to assess tw. models that have been proposed to describe drying kinetics, and thus to provide a quantification of non-linear drying rates, of embryonic axes excised from recalcitrant seeds. These models are an exponential drying time course, and a modified inverse relationship, respectively. For the six species investigated here the inverse function w.s generally found to fit drying data better than the exponential function under both rapid and slow.drying conditions, and so is recommended. The rate of drying, under the conditions used here, w.s determined by axis size and possibly the nature of the axis outer coverings, rather than the w.ter activity difference betw.en the tissue and surrounding air.

关键词： desiccation drying rate recalcitrant seeds.

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Increased Drying Rate Low.rs the Critical w.ter Content for Survival in Embryonic Axes of English Oak (Quercus robur L.) Seeds

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Journal of Integrative Plant Biology 2011年第4期53卷 270-280页

作者： Tobias M.Ntuli w.lliam E.Finch-Savage Patricia Berjak norman w.pammenter Plant Germplasm Conservation Research School of Biological and Conservation SciencesUniversity of KwaZulu-NatalWestville CampusPrivate Bag X54001Durban 4000South Africa Department of Life and Consumer Sciences University of South AfricaPrivate Bag X6Florida 1710JohannesburgSouth Africa w.rw.ck HRI Warwick UniversityWellesbourneWarwick CV35 9EFUK Plant Germplasm Conservation Research School of Biological and Conservation SciencesUniversity of KwaZulu-NatalWestville

The potential to cryopreserve embryonic axes of desiccation-sensitive（recalcitrant） seeds is limited by damage during the desiccation necessary for low.temperature survival,but the basis of this injury and how.to reduce it is not w.ll *** effects of drying rate on the viability,respiratory metabolism and free radical-mediated processes w.re therefore investigated during dehydration of Quercus robur L embryonic ***,assessed by evidence of germination and tetrazolium staining,show.d a sharp decline at 0.27 and 0.8 g/g during rapid（〈12 h） or slow.3d） dehydration,*** dehydration therefore low.red the critical w.ter content for *** any given w.ter content rapid dehydration w.s associated w.th higher activities of the free radical processing enzymes,superoxide dismutase,catalase and glutathione reductase and low.r levels of hydroperoxide and membrane *** dehydration w.s also associated w.th low.r malate dehydrogenase activity,and a reduced decline in phosphofructokinase activity and in levels of the oxidized form of nicotinamide *** may have contributed to increased damage during slow.dehydration,since viability declined even in hydrated storage after 3 *** results presented are consistent w.th rapid dehydration reducing the accumulation of damage resulting from desiccation induced aqueous-based deleterious reactions.

关键词： Quercus robur L Seeds Figure NADH

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豌豆种子吸胀过程中脱水耐性变化的时间模式(英文)

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云南植物研究 2009年第3期31卷 239-246页

作者：宋松泉 Patricia BERJAK norman w.pammenter 中国科学院植物研究所北京100093 School of Biological and Conservation Sciences University of KwaZulu-Natal

研究了豌豆种子吸胀过程中脱水耐性的变化模式。种子在吸胀初期迅速吸收水分,然后缓慢吸收直到平台期。电解质渗漏速率在吸胀初期增加直到11h,然后随着吸胀下降。在吸胀过程中,种子的萌发率逐渐增加,种子和胚轴的脱水耐性逐渐丧失,10%和... 详细信息

研究了豌豆种子吸胀过程中脱水耐性的变化模式。种子在吸胀初期迅速吸收水分,然后缓慢吸收直到平台期。电解质渗漏速率在吸胀初期增加直到11h,然后随着吸胀下降。在吸胀过程中,种子的萌发率逐渐增加,种子和胚轴的脱水耐性逐渐丧失,10%和50%的种子和胚轴被脱水致死的含水量明显增加。赤霉素和脱落酸处理改变豌豆种子的萌发特性,提高胚轴的脱水耐性。研究结果表明,吸胀的豌豆种子脱水耐性的丧失是一种数量性状,正常性种子吸胀后脱水耐性的变化能够作为种子顽拗性研究的模式系统。

关键词：豌豆脱落酸脱水脱水耐性吸胀作用萌发正常性顽拗性

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