问:促进三倍体无籽西瓜果实发育所需的生长素是从哪里来的?答:植物生长素具有促进果实发育的功能。对有籽果实来说,发育着的种子是果实发育所必需的条件,因为促进果实发育所必需的生长素是胫珠发育成种子的过程中合成的。然而,象三倍体无籽西瓜果实,既然胚珠不能发育成种子,也就不能由此合成生长素促进 Q: Where is the auxin needed to promote the development of triploid seedless watermelon fruit? A: Auxin has a function to promote fruit development. For seed-bearing fruits, the developing seed is a necessary condition for fruit development because the auxin necessary for fruit development is synthesized during development of the tibia beads into seeds. However, like triploid seedless watermelon fruit, since the ovule can not develop into a seed, it can not be promoted by this synthetic auxin