Abstract:

The growth angle and morphostructure of seedling function leaves in 4 tomato strains were investigated under low light density environments. The results showed that leaf area and the specific leaf weight of 4 tomato strains were decreased and the decreased extent of stains 1 and 2 was lower than that of stains 3 and 4 under low light density. palisade and spongy tissues of tomato leaves became thinner, leaves were open and flat and chloroplast grana lamellae was steady in stains 1 and 2; while in stains 3 and 4, the palisade and spongy tissues became more thinner, leaves hung down and chloroplast grana lamellae was indistinct and the numbers decreased. The growth angle and the chloroplast character of tomato leaves which closely related to low light tolerance under low light density environments should be viewed as the index to identify low light tolerance tomato strain.