关键词: 树莓, 净光合速率, 光饱和点, 果实成熟期, 基生枝, 花期

Abstract: In this study, Laiweili raspberry seedlings were used as materials, and treated by different shading intensities (2 treatment groups: group 1 (T₁)-40% sunlight; group 2 (T₂)-60% sunlight; CK-sunlight). After shading treatments for 60 d, the morphological and physiological parameters (growth rate, flowering and fruiting, photosynthetic characteristics) were measured under different light intensities. The results showed that P_n values of the treated leaves were reduced by 28% for T₁ and 53% for T₂ as compared with CK. Shading treatments led to significant reductions (P<0.05) in light saturation point (LSP), light compensation point (LCP), dark respiration rate (R_d) and apparent quantum efficiency (α). However, there was no significant differences in the above parameters between T₁ and T₂(P>0.05). Moreover, the shading treatments also resulted in significant reductions in the number of basal branches and root-sprouting seedlings, of which the number of basal branches of T₁ treatment was only one third of CK. The fruit mature period was delayed by 8 d for T₁ and 20 d for T₂ as compared with CK.

Key words: ‘Laiweili&rsquo, raspberry;net photosynthetic rate;light saturation point;fruit mature period;basal branch;flowering period