单词	self-sterile
释义	self-sterile /sɛlfˈstɛrʌɪl / adjective Biology Incapable of self-fertilization.Lower seed numbers in outcrossed fruits of self-fertile versus self-sterile plants probably reflect inbreeding depression due to mating of related individuals.... Many plants, apparently physically equipped for self-fertilization, were completely self-sterile. By contrast, mutant hermaphrodites are self-sterile when unmated due to a failure in spermatid activation. Derivatives self-sterility noun ... This is because the genetic load required for complete self-sterility based on inbreeding depression is so unusually high that it is rarely, if ever, reached by any species. In fact, the evolutionary pathway from obligate outcrossing based on self-sterility to predominant self-fertilization is among the most common and widespread trends in flowering plants. This was accomplished by isolating single-conidium cultures from each progeny and testing for self-sterility and for mating type.
随便看	shubunkin shuck shucker shudder shudderingly shuddery Shudra shuffle shuffleboard irradiance irradiant irradiate irradiation irrational irrationalise irrationalism irrationalist irrationality irrationalize irrationally Irrawaddy irrebuttable irrebuttable presumption irreclaimable irreclaimably

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