Tobacco;
Science;
Research;
Institute;
Chongqing;
400715;
China;
Leaf;
Branch;
of;
Corporation;
400023;
College;
Agronomy;
Department;
Henan;
Agricultural;
University;
National;
Cultivation;
and;
Physiology;
andBiochemistry;
Centre;
Zhengzhou;
450002;