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Effects of Seed-Soaking with Propyl Dihydrojasmonate on Phosphate Uptake and Assimilative Efficiency of Soybean(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2008年04期
Page:
604-609
Research Field:
Publishing date:

Info

Title:
Effects of Seed-Soaking with Propyl Dihydrojasmonate on Phosphate Uptake and Assimilative Efficiency of Soybean
Author(s):
DONG Deng-feng1; 2; LI Yang- rui1; HUANG Jing-hua2; Jiang Li-geng2; LIANG He2
1Key-Lab of Guangxi Crop Genetic Improvement and Biotechnology，Nanning 530007，Guangxi;
2College of Agriculture，Guangxi University，Nanning 530004，Guangxi，China
Keywords:
Low phosphorus; Soybean; Propyl dihydrojasmonate(PDJ); Phosphorus uptake; Phosphorus assimilation
PACS:
S565.1
DOI:
10.11861/j.issn.1000-9841.2008.04.0604
Abstract:
Phosphorus inefficient，including uptake and/or assimilative inefficient，is one of the most important factors which restrict the crop productivity.The P efficiency varies among crop species and varieties，and can be regulated by exogenous chemicals.In order to elucidate the mechanisms of differentia of P efficiency among varieties as guidance to crop breeding，and to evaluate the potential of chemicals application to enhance P efficiency，soybean cultivar BX10，with high phosphorus efficiency，and its contrasting variety BD2，were cultured hydroponically to investigate their P uptake and assimilative efficiency when regulated by Propyl dihydrojasmonate(PDJ).The results showed that accumulation of phosphorus and dry matter in soybean were decreased by low phosphorus with a higher extent to BD2 than to BX10.Phosphorus uptake and transportation，however，was induced by low phosphorus through increasing in root active uptake area and values of Imax and α，and decreasing in values of Km，Cmin as well as their derivative index β.BX10 showed stronger P uptake than BD2 under P stress or not，in accordance with bigger root system，especially root active uptake area.BX10 did not show a significant advantage over BD2 in uptake kinetic parameters，though a higher affinity to P occurred in BX10，indicating higher potential of uptake in extremely low P environment，the rates of maximal intake rate and transportation were actually lower.Low phosphorus facilitated phosphorus assimilation into dry matter，with a higher extent in BX10 than in BD2.Under low phosphorus stress，pretreatment with PDJ increased the accumulation of dry material and phosphorus，with a better effect on root than on shoot，and on BD2 than on BX10.PDJ increased root active uptake areas of two low P stressed soybean varieties，however，played little role in uptake kinetics and assimilative efficiency.The results concluded that pretreatment with PDJ can increase root active uptake area in accordance with increase in P uptake and dry matter.

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Last Update: 2014-10-07