| Sweetpotato[Ipomoea batatas(L.)Lam.]is an important vegetable and food crop for humans, an important feed for domestic animals as well as an industrial material.It has many nutrient components and many hygienic functions such as the antioxidant activity and prophylaxis of cancers and tumors.Sweetpotato is promising for producing the ethanol as fuel in our country for its advantages of higher biological output,energy output and ethanol conversion ratio compared with other crops.It will not threat the national security of food supplies to produce fuel from sweetpotato. Obviously,it will benefit the development of energy industry and health care and in China promote the sweetpotato production for high yield and quality.Reciprocal graft was made among five sweetpotato genotypes with different storage root flesh colours,yield and top growth characteristics,which were purple-fleshed genotypes "Yuzi 263" and "2-I19-43",saffron yellow-fleshed genotype "2-19-99",yellowy-fleshed genotype "97-402-162", and white-fleshed genotype "Xushu 18".In the whole experiment,reciprocal graft had been done to investigate the contents of soluble sugar,starch,protein,beta-carotene and anthocyanin and the major characters including root fresh weight(RFW),root dry weight(RDW),top fresh weight (TFW),top dry weight(TDW),number of base branches,length of longest vine,diameter of vane, abloom traits etc after grafted 65 days,95 days,125 days.According to the result,the source-sink relationships concerning these economic traits were primary analyzed in this paper.The conclusions are as below:(1)After reciprocal graft with these 5 different sweetpotato genotypes,the effects of stock, scion,growth period,and the interaction of stock×scion,scion×growth period showed highly significant(P≤0.01,the same as below)influences on RFW and RDW statistically.The interaction of stock×growth period and stock×scion×growth period were significant(P≤0.05,the same as below). Of the 25 reciprocal grafting combinations in this study,"Xushu 18×2-19-99" had significantly higher RFW than the rest except "97.402-162×2-19-99","2-19-99×2-19-99","2-19-99×2-I19-43", "2-19-99×Xushu 18" and the control plant "2-19-99","2-I19.43","Xushu 18"."Xushu 18×2-19-99" had significantly higher RDW than the rest grafting combinations except "97-402-162×2-19-99"、"2-19-99×2-19-99" and the control plant "2-19-99","2-I19-43","Xushu 18".After "Yuzi 263" graft,RFW and RDW increased to different degrees.RFW and RDW of"Yuzi 263×2-19-99" were higher than "Yuzi 263×Yuzi 263" and the control plant "Yuzi 263" among the grafting combinations of "Yuzi 263" as stock.,and RFW and RDW were lower than the respective control among the grafting combinations of"2-19-99" and "2-I19-43" as stock.Among the grafting combinations of "97-402-162" and "Xushu 18" as stock,RFW and RDW increased when the stock graft with "2-19-99",and decreased when with other genotypes."Yuzi 263" has upper ability of enlarge sink capacity,that is ability of increase yield than other sweetpotato genotypes."2-19-99" has upper ability of source capacity.After reciprocal graft,we could select the best or worst grafting combination based on TFW, TDW,number of base branches,length of longest vine,and diameter of vane,which is not the best or worst one for the RFW and RDW probably.(2)After reciprocal graft with these 5 different sweetpotato genotypes,the effects of stock and growth period,and the interaction of stock×scion×growth period showed highly significant influences on root soluble sugar content statistically.Among the interaction,the scion effect was significant,and the interactions of stock×scion and seion×growth period were insignificant.After reciprocal graft,the effects of stock and scion and interaction of scion×growth period showed highly significant influences on root starch content.The effect of growth period,and the interactions of stock×scion and stock×growth period were significant.The interaction of stock×scion×growth period were insignificant.After reciprocal graft,the effects of stock,scion and growth period,and the interactions of stock×growth period and scion×growth period showed highly significant influences on root protein content.The interactions of stock×scion and stock×scion×growth period were significant.The protein contents in the grafting combinations of "Yuzi 263" and "2-I19-43" as stock were significantly higher than that in others genotypic stock.(3)After reciprocal graft with these 5 different sweetpotato genotypes,the effects of stock and growth period,and the interactions of stock×scion,stock×growth period and stock×scion×growth period were highly significant influences on root beta-carotene content statistically.The effect of scion and interaction of scion×growth period were significant.After reciprocal graft,the effects of stock showed highly significant influences on anthocyanin content of purple-fleshed root.It indicated that the anthocyanin content of"2-I19-43" is significantly higer than "Yuzi 263".The effect of scion and growth period,and the interaction of stock×scion, stock×growth period,scion×growth period and stock×scion×growth period were insignificant. (4)After reciprocal graft with these 5 different sweetpotato genotypes,different genotype stocks significantly influence on the flower number of "2-19-99" statistically."2-19-99" had few flowers naturally in Chongqing region,but the number of flowers of "2-19-99×2-19-99","Yuzi 263×2-19-99","2-I19-43×2-19-99","Xushu 18×2-19-99" had significantly increased after graft. "97-402-162","Yizi 263","2-I19-43","Xushu 18" could not bloomed whether reciprocal grafted or not."2-I19-43" as stock grafted with "2-19-99",flower number is 15.6,which is significantly higer than the control,equal to 4.6 times of control.The maximum of flower number per day is 64, equal to 3.2 times of control. |
PDF Full Text Request