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Induction of desiccation tolerance in desiccation sensitive Citrus limon seeds

Journal of Integrative Plant Biology 2019年第5期61卷 624-638页

作者： Alexandre Marques Harm Nijveen Charles Somi Wilco Ligterink henk hilhorst Laboratory of Plant Physiology Wageningen University and ResearchWageningenThe Netherlands Bioinformatics Group Wageningen University and ResearchWageningenThe Netherlands

Many economically important perennial species bear recalcitrant seeds, including tea, coffee, cocoa, mango,citrus, rubber, oil palm and coconut. Orthodox seeds can be dried almost completely without losing viability, but so-called recalcitrant seeds have a very limited storage life and die upon drying below a higher critical moisture content than orthodox seeds. As a result, the development of longterm storage methods for recalcitrant seeds is *** this critical moisture content would be very valuable since dry seed storage is the safest, most convenient and cheapest method for conserving plant genetic ***, we have attempted to induce desiccation tolerance(DT) in the desiccation sensitive seeds of Citrus limon. We show that DT can be induced by paclobutrazol(an inhibitor of gibberellin biosynthesis) and we studied its associated transcriptome to delineate the molecular mechanisms underlying this induction of DT. Paclobutrazol not only interfered with gibberellin related gene expression but also caused extensive changes in expression of genes involved in the biosynthesis and signaling of other hormones. Paclobutrazol induced a transcriptomic switch encompassing suppression of biotic-and induction of abiotic *** hypothesize that this is the main driver of the induction of DT by paclobutrazol in C. limon seeds.

关键词： economically important recalcitrant seeds paclobutrazol in C.limon seeds

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A Footprint of Plant Desiccation Tolerance. Does It Exist？

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Molecular Plant 2018年第8期11卷 1003-1005页

作者： henk W.M. hilhorst Maria-Cecilia D. Costa Jill M. Farrant Laboratory of Plant Physiology Wageningen University and Research Droevendaalsesteeg 1 Wageningen 6708 PB the Netherlands Department of Molecular and Cell Biology University of Cape Town Private Bag Rondebosch Cape Town 7701 South Africa

Desiccation tolerance （DT）, the ability to survive loss of more than 90% of cellular water （≤0.1 g H2O g^-1 dry mass） for prolonged periods, is common in seeds （90% of angiosperm species） but rare in vegetative tissues （0.04% of land plants; reviewed in Gaff and Oliver, 2013）. Vegetative DT is more widespread in non-tracheophytes, being present in 25 species of algae, 158 bryophytes species, and all lichens, but is rare in tracheophytes, being displayed in 64 pteridophyte and 135 angiosperm species （Gaff and Oliver, 2013）.

关键词： RESURRECTION EVOLUTION GENOME

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Viability of recalcitrant Araucaria angustifolia seeds in storage and in a soil seed bank

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Journal of Forestry Research 2020年第6期31卷 2413-2422页

作者： Ezequiel Gasparin Jose M.R.Faria Anderson CJose Olivia AOTonetti Rodrigo Ade Melo henk W.M.hilhorst Departamento de Ciencias Florestais Universidade Federal de Santa Maria(UFSM)Avenida Roraima1000CamobiSanta MariaRS 97105-900Brazil Departamento de Ciencias Florestais Universidade Federal de Lavras(UFLA)Caixa Postal 3017LavrasMGBrazi1 Wageningen Seed Lab Laboratory of Plant PhysiologyWageningen UniversityDroevendaalsesteeg 16708 PB WageningenThe Netherlands

Araucaria angustifolia(Bertol.)Kuntze is a representative species of the Mixed Ombrophilous Forest in the Atlantic Forest Biome of *** development of a germplasm conservation protocol for long-term seed bank storage is compromised for this species,as it is sensitive to ***,in situ establishment of a soil seed bank in its natural habitat may be *** study evaluates the storability of two provenances of *** seeds and their behavior in an artificial soil seed bank in two forest environments(understory and edge).Results show that both seed provenances may be stored at 5C for approximately 12 months,retaining high *** subsequent decrease in germination was associated with a reduction and an increase in seed water content,as well as with increased electrical *** the understory environment,seed viability was above 85%for the first 60 days,and at the end of the experiment(270 days),seedlings ***,at the forest edge,there was a total loss of seed viability after 120 days associated with a reduction in water content and high *** is concluded,therefore,that short-term storage of *** seeds is possible in a cold room,which is fundamental to supply seed demand outside the production *** cover conservation is important for regeneration and conservation of the species.

关键词： Brazilian pine Desiccation sensitivity Forest cover Soil seed bank Storability

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