in response to low light among varieties (Zhu et al,
2008; Liu et al, 2009). When subjected to low light for
15 d (when treatment had commenced at the initial
heading stage), varieties that are tolerant to low light
exhibit higher chlorophyll b and lower chlorophyll a/b
content in their leaves when compared with those
perform poorly in low light (Zhu et al, 2008). Similarly,
leaf chlorophyll a and b content during the grainfilling
stage is markedly enhanced in low light tolerant
varieties after being treated by low light from the
transplanting to the booting stages, whereas the
opposite is found in varieties that perform poorly in
low light