Transpiration from Tomato Fruit Occurs Primarily via Trichome-Associated Transcuticular Polar Pores

被引:19
作者
Fich, Eric A. [1 ]
Fisher, Josef [2 ]
Zamir, Dani [2 ]
Rose, Jocelyn K. C. [1 ]
机构
[1] Cornell Univ, Sch Integrat Plant Sci, Plant Biol Sect, Ithaca, NY 14853 USA
[2] Hebrew Univ Jerusalem, Robert H Smith Inst Plant Sci & Genet, Fac Agr, IL-76100 Rehovot, Israel
基金
美国国家科学基金会; 美国国家卫生研究院;
关键词
CUTICULAR TRANSPIRATION; WATER PERMEABILITY; BARRIER PROPERTIES; PLANT CUTICLES; STOMATAL CLOSURE; WAX; LEAVES; MEMBRANES; PERMEATION; COMPONENTS;
D O I
10.1104/pp.20.01105
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Hydrophilic pores created by trichomes in the tomato fruit cuticle provide the main route for postharvest transpirational water loss. Nonstomatal water loss by transpiration through the hydrophobic cuticle is ubiquitous in land plants, but the pathways along which this occurs have not been identified. Tomato (Solanum lycopersicum) provides an excellent system in which to study this phenomenon, as its fruit are astomatous and a major target for desiccation resistance to enhance shelf life. We screened a tomato core collection of 398 accessions from around the world and selected seven cultivars that collectively exhibited the lowest and highest degrees of transpirational water loss for a more detailed study. The transpirational differences between these lines reflected the permeances of their isolated cuticles, but this did not correlate with various measures of cuticle abundance or composition. Rather, we found that fruit cuticle permeance has a strong dependence on the abundance of microscopic polar pores. We further observed that these transcuticular pores are associated with trichomes and are exposed when the trichomes are dislodged, revealing a previously unreported link between fruit trichome density and transpirational water loss. During postharvest storage, limited self-sealing of the pores was detected for certain cultivars, in contrast with the stem scar, which healed relatively rapidly. The abundance of trichome-associated pores, together with their self-sealing capacity, presents a promising target for breeding or engineering efforts to reduce fruit transpirational water loss.
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页码:1840 / 1852
页数:13
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