棉 花 学 报 Cotton Sciencez 2006，18(6)：357-361
Effects of Cotton Seed Index on Growth and Physiological Characteristics of Outside“Boll-Leaf System”on Lower Fruit Branch Abstract：Using insect-resistant transgenic Bt（Bacillus thuringiensis）cotton 33B variety as material， growth and physiological characteristics of outside“boll-leaf system”on lower fruit branch were studied. This experiment was done at the teaching and experiment station of Agricultural University of Hebei from 2003 to 2004. Three different kinds of cottonseeds，which based on seed index，were selected before sowing. They were large-size and plumpness，seed percent was 11.7~12.0g (treatⅠ)；large-size and lower plumpness， seed percent was 10.2~10.9 g(treatⅡ)；small-size and plumpness，seed percent was 7.5~7.9g (treatⅢ). The results showed that large-size and plumpness seed was not only propitious to building larger leaf on flowering day，but also enhancing the physiological quality of source leaves and the dry weight of seed cotton per boll in mature stage. Effects of small-size and plumpness on growth and physiological status of outside“boll-leaf system”on lower fruit branch was more obviously than those of large-size and lower plumpness seed. Its dry boll weight was the least. So it would be very important to select large-size and plumpness cottonseeds before sowing in the field.
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