Therefore, it is concluded that regulation of callus formation and differentiation of the calli by exogenous hormone is closely related to some endogenous factors and external condition.
因此，认为植物产生愈伤组织和再分化为植株不仅与外源激素有关，而且因植物材料和营养条件而异。
The results showed that the growth of seedlings was promoted by exogenous polyamines under normal water and drought conditions, and more notable under drought condition.
结果表明，在正常和干旱条件下，外源多胺均能促进油松幼苗的生长，且干旱条件下的促进效果更为显著。
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