Regulation morphological and architectural acclimation of soybean
seedlings to shade
Abstract
Maize shading affects the growth and development of soybean in maize
soybean intercropping systems. Two different soybean varieties were
(ND12, high shade-tolerant, and GX3, low shade-tolerant) relay intercrop
with maize in different (T1, double row, and T2, single row) relay strip
intercropping systems, and the results of the both planting arrangements
of strip intercropping system were compared with the sole planting
system of soybean. The results showed that shading reduced the content
of photosynthetic pigment per unit area of soybean leaf, Fv/Fm, ΦPSⅡ,
and Fv/Fo of ND12 and GX3 under T1 and T2. Moreover, T1 and T2 also
decreased the density and size of stomata, leaf thickness, palisade
tissue thickness of the tissue, and the size of the chloroplast and
starch grains, while increased the thickness of the granum lamellae in
both varieties of soybean. Nevertheless, the leaf area, aboveground
biomass, photosynthetic capacity, photosynthetic organs measured
morphological and architectural indices were found maximum in ND12
compared to GX3 in all planting patterns.