caa a22 4500 605480664 CHVBK 20210128100416.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s11099-015-0121-6 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0121-6 Differences in transport of photosynthates between high-and low-yielding Ipomoea batatas L. varieties [Elektronische Daten] [H. Liu, S. Chai, C. Shi, C. Wang, G. Ren, Y. Jiang, C. Si] Previous studies have focused mainly on the accumulation of photosynthates and less on their distribution in sweet potato (Ipomoea batatas L.). In addition, the effect of photosynthate accumulation in root tubers on photosynthate distribution was not considered. Thus, a field experiment was carried out from May to October (2011 and 2012) to clarify the differences in photosynthate transport between high- and low-yielding sweet potato. This study mainly focused on the photosynthetic capacities of leaves, photosynthate distribution, and characteristics of photosynthate accumulation in root tubers. Results showed the high-yielding varieties displayed the higher fresh root tuber yield and the economic coefficient than the low-yielding varieties. They also showed greater net photosynthetic rate with a pronounced increase at the early and middle growth stages (8.9% and 11.4%, respectively). After the growth peak, the leaf area index (LAI) of the high-yielding varieties decreased with time and was maintained at 2∼3 until harvest, whereas the LAI of the low-yielding varieties decreased slowly. The high-yielding varieties reached the 13C distribution rate ≥ 50% at the early (2011, 2012) and middle (2011) growth stages, whereas the low-yielding varieties reached it at the late (2011) or middle (2012) growth stages. At harvest, the 13C distribution rates in the branches and root tubers of the high-yielding varieties were 6.0-20.3% and 73.7-91.2%, respectively, whereas those of the low-yielding varieties were 29.6-34.7% and 60.7-63.5%, respectively. The high-yielding varieties showed the remarkable initial potential in root tubers, which was much better than that of the low-yielding varieties. The high-yielding varieties also produced heavier root tubers and the higher number of root tubers per plant at the early bulking stage. The root tubers also attained the greater content of soluble sugar and starch. The high-yielding varieties formed root tubers earlier, showed strong abilities to transport photosynthates into the root tubers, and exhibited a higher mean accumulation rate. These varieties could also reduce the photosynthate consumption in branch leaves and stems. Therefore, the high-yielding varieties established growth advantage for the root tubers earlier. It contributed to a reasonable distribution structure of photosynthates that led to the high root tuber yield. Based on our results, effective agricultural measures can be chosen to improve the root tuber yield of sweet potato. The Institute of Experimental Botany, 2015 13C distribution rate nationallicence photosynthate distribution nationallicence sweet potato nationallicence tuber roots nationallicence yield nationallicence C0 : initial potential of root tubers nationallicence D : the accumulation duration (about 90% growth increment accumulated) nationallicence DAP : days after planting nationallicence HY : high-yielding nationallicence K : theoretical maximum dry yield of root tubers nationallicence LAI : leaf area index nationallicence LMA : leaf mass per area nationallicence LY : low-yielding nationallicence Rmax : maximum accumulation rate nationallicence Rmean : mean accumulation rate nationallicence T/R value : top/root ratio nationallicence Tmax : time of the maximum accumulation rate nationallicence Liu H. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut Chai S. Research Institute of Food Crops, Hubei Academy of Agricultural Sciences, 430064, Wuhan, China aut Shi C. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut Wang C. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut Ren G. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut Jiang Y. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut Si C. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/3(2015-09-01), 378-388 0300-3604 53:3<378 2015 53 11099 https://doi.org/10.1007/s11099-015-0121-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0121-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu H. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut NATIONALLICENCE 700 1- Chai S. Research Institute of Food Crops, Hubei Academy of Agricultural Sciences, 430064, Wuhan, China aut NATIONALLICENCE 700 1- Shi C. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut NATIONALLICENCE 700 1- Wang C. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut NATIONALLICENCE 700 1- Ren G. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut NATIONALLICENCE 700 1- Jiang Y. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut NATIONALLICENCE 700 1- Si C. Agronomy College, Shandong Agricultural University/State Key Laboratory of Crop Biology, 271018, Tai'an, China aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/3(2015-09-01), 378-388 0300-3604 53:3<378 2015 53 11099