一.緒論米丘林与巴甫洛夫的生物与其環境統一的学說向植物学者提出一個很重要而迫切的課題:即是植物如何作為一個整体來適应改變着的環境之間題。我們知道,在植物進化由簡到繁的階梯上,組織与器官間的分工愈細,它們之間的密切合作与協調共濟也就愈益重要。高等植物必需把体內各部進行的各种新陳代謝綜合起來成為 I. INTRODUCTION The doctrine of the unity of Michurin and Pavlov’s creatures with their environment raises a very important and pressing issue for botanists: how plants as a whole adapt themselves to the changing environment. We know that the more detailed the division of labor between tissues and organs, the closer the cooperation and coordination between the plants becomes more and more important. Higher plants must integrate the various metabolic processes in their bodies