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通过用生长素处理草莓(Fragaria x ananassa Duch)未授粉的花和除去瘦果的花托研究草莓座果及果实发育的控制。用萘乙酸(NAA)加上2%二甲酯增效砜(DMSO)喷布或浸蘸,可使座果率从50%提高到100%。这对诱发草莓单性结实提供了一种简便而可靠的方法。当对生长素诱导草莓花托生长和玉米或燕麦胚芽鞘伸长进行比较时发现,草莓果实对生长素的反应不如胚芽鞘敏感。低于最适NAA浓度诱发的单性结实,果实生长受到限制。这样的果实保留生长素的反应能生存30～45天,此时再行第二次NAA处理,可使其恢复正常生长和发育。因此,可使果实生育期从s0天延长到60天。相反,用最适生长素浓度处理未授粉的花同授粉而未用生长素处理的花,果实均在25～So天内成熟.15种生长素类似物都有刺激除去瘦果后花托的生长效应。在诱导单性结实方面,这些化合物的相对效应十分不同。但这些化合物在刺激玉米胚芽鞘伸长方面其相对效应有些例外。
Strawberry fruit and fruit development control was studied by treating the non-pollinated flowers of Fragaria xananassa Duch with auxin and removing torches of achenes. With NAA plus 2% dimethylsulfoxide (DMSO) sprayed or dipped, the fruit set rate increased from 50% to 100%. This provides a simple and reliable method for inducing strawberry parthenocarpy. When comparing auxin-induced growth of strawberry receptacle with that of maize or oat cole sheath, it was found that the response of strawberry fruit to auxin was not as sensitive as that of coleoptile. Below the optimum concentration of NAA-induced parthenocarpy, fruit growth is limited. This fruit retention of auxin response to survive 30 to 45 days, then the second time NAA treatment, can make it return to normal growth and development. Therefore, fruit growth period can be extended from s0 to 60 days. In contrast, flowers treated with non-pollinated and non-auxin-treated flowers and fruits all matured in the optimum somatotropin concentration at 25 ~ So for 15 days.All 15 auxin analogs had the effect of stimulating the growth of receptacle after removing achene. The relative effects of these compounds are quite different in inducing parthenocarpy. However, the relative effects of these compounds in stimulating corn cole sheath elongation are some exceptions.