摘要
Sweetpotato （Ipomoea batatas L. Lain.） ranks fifth among the most important food crops, after rice, wheat, maize and cas- sava, on a fresh-weight basis in developing countries （Scott and Maldonado, 1999）. Sweetpotato cultivars have white, yellow, purple or orange flesh, but only orange-fleshed sweetpotato cultivars are the rich sources of β-carotene, which is the precursor of vitamin A （Failla et al., 2009）. Accordingly, the orange-fleshed sweetpotato is the main source of 6-carotene for the people in underdeveloped coun- tries in Africa and Southeast Asia. Unfortunately, theβ-caro- tene content in most sweetpotato cultivars is rather low and insufficient in meeting the normal demand of human physi- ology （Liao et al., 2008）. Hence, developing sweetpotato cultivars rich inβ-carotene will be most desirable in crop development.
Sweetpotato （Ipomoea batatas L. Lain.） ranks fifth among the most important food crops, after rice, wheat, maize and cas- sava, on a fresh-weight basis in developing countries （Scott and Maldonado, 1999）. Sweetpotato cultivars have white, yellow, purple or orange flesh, but only orange-fleshed sweetpotato cultivars are the rich sources of β-carotene, which is the precursor of vitamin A （Failla et al., 2009）. Accordingly, the orange-fleshed sweetpotato is the main source of 6-carotene for the people in underdeveloped coun- tries in Africa and Southeast Asia. Unfortunately, theβ-caro- tene content in most sweetpotato cultivars is rather low and insufficient in meeting the normal demand of human physi- ology （Liao et al., 2008）. Hence, developing sweetpotato cultivars rich inβ-carotene will be most desirable in crop development.
基金
supported by the National High-tech R&D Program(863 Program)(Nos.2011AA10A206 and 2012AA101204-3)
Program for New Century Excellent Talents in University(No.NCET-12-0930)
Fundamental Research Funds for the Central Universities(No.XDJK2013A024)
the earmarked fund for China Agriculture Research System (No.CARS-11-C-20)
