The functions of proteinase inhibitors in seeds
نویسندگان
چکیده
Proteinase inhibitors comprise a significant component of the protein content of many seeds and at least three functions have been ascribed to this group of proteins. They have been proposed to function as (1) protectants against seed predators, (2) as storage proteins, and (3) as regulators of endogenous protease activity, particularly in the dry seed. The evidence which supports each proposed function is reviewed, with greatest emphasis on whether these proteins do function as regulators of endogenous proteins in seeds. More recently, the use of more sensitive detection methods has revealed a further tier of proteinase inhibitors which accumulate at very much lower concentrations than those inhibitors normally described from seeds. Using apple seeds as an example, the inhibitory activity of these proteins is described and some speculation as to their likely roles in seeds is included. Additional key words: cystatins, cysteine proteases, insect pest resistance, serine proteases
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تاریخ انتشار 2015