Characteristics of urea 15N absorption, allocation, and utilization by sweet-cherry (Prunus avium L.)
Zhao, F-Xia.; Jiang, Y-Mao.; Peng, F-Tian.; Gao, X-Bin.; Liu, B-Hua.; Wang, H-Yun.; Zhao, L.
Ying Yong Sheng Tai Xue Bao 19(3): 686-690
2008
ISSN/ISBN: 1001-9332 PMID: 18533545 Document Number: 620949
With five-year old 'Zaodaguo' sweet-cherry ( Pranus avium L.) as test material, this paper studied the characteristics of its urea N-15 absorption, allocation, and utilization when applied before bud-break. The results showed that the Ndff of different organs increased gradually with time, and was higher in fine roots and storage organs at full-blooming stage. At fruit core-hardening stage, the Ndff of long shoots and leaves increased quickly, reaching to 0. 72% and 0. 59%, respectively. From fruit core-hardening to harvesting stage, the Ndff of fruit had a rapid increase, with the peak ( 1. 78%) at harvesting stage. After harvest, the Ndff of neonatal organs increased slowly while that of storage organs increased quickly. At full-blooming stage, the absorbed N-15 in roots was firstly allocated to storage organs, with the highest allocation rate ( 54. 91 %) in large roots. At fruit core-hardening stage, the allocation rate in fine roots and storage organs decreased from 85. 43 % to 55. 11 %, while that in neonatal branches and leaves increased to 44. 89 %. At harvesting stage, the allocation rate in different organs had no significant change, but after harvest, the absorbed N-15 had a rapid translocation to storage organs, and the allocation rate in fine roots and storage organs reached the highest (72. 26%) at flower bud differentiation stage. The N-15 allocation rate in neonatal branches and leaves at flower bud differentiation stage was decreased by 19. 31%, compared with that at harvesting stage. From full-blooming to flower bud differentiation stage, the utilization rate of urea N-15 was increasing, and reached the peak ( 16. 86%) at flower bud differentiation stage.