摘要
Numerous research publications over the past 20 years have made it quite clear that a better understanding of the molecular and genetic basis for variation in root system architecture（RSA）will greatly aid the development of crop varieties with improved and more ef ficient nutrient and water acquisition under limiting conditions.
Numerous research publications over the past 20 years have made it quite clear that a better understanding of the molecular and genetic basis for variation in root system architecture（RSA）will greatly aid the development of crop varieties with improved and more ef ficient nutrient and water acquisition under limiting conditions.
