|Table of Contents|

Differences of Phosphorus Efficiency Characteristics and Root Properties  Between Two Citrus Seedlings Under Phosphorus Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年15
Page:
12-17
Research Field:
Publishing date:

Info

Title:
Differences of Phosphorus Efficiency Characteristics and Root Properties  Between Two Citrus Seedlings Under Phosphorus Stress
Author(s):
(College of Agriculture; Guizhou University/Guizhou Fruits Engineering Technology Research Centre; Guiyang; Guizhou 550025)
(College of Agriculture，Guizhou University/Guizhou Fruits Engineering Technology Research Centre，Guiyang，Guizhou 550025)
Keywords:
citrus; phosphorus efficiency; root; free amino acid
PACS:
-
DOI:
10.11937/bfyy.20170693
Abstract:
Two citrus seedlings (Citrus chuana Hort.and Poncirus trifoliata Raf.) were used as test materials，and evaluated for differences in dry matter weight，phosphorus accumulation and root properties under different phosphorus (P) application rates by using a sand culture method.Efficient genotype citrus played an important roles in promoting phosphorus stress from the perspective of the root properties.The purpose of this study was to provide a scientific basis for identifying the main factors that affecting phosphorus absorption of citrus and improving efficiency of nutrient utilization of genetic improvement through root plasticity.The results showed that the P efficiency of P.trifoliata was 91.22%，and C.chuana 53.24%.Under low P stress the P absorption efficiency of P.trifoliata significantly was reduced by 70%，P transfer and utilization efficiency significantly got an increase of 59% and 300%；meanwhile the P absorption and transfer efficiency of C.chuana were significantly reduced by 87% and 6%，P utilization efficiency increased 200%.The root/shoot ratio of C.chuana was significantly higher than in the sand with low P stress，with an increase of 120%，while the P.trifoliata was significantly decreased，with a decline of 24%.With low P stress，the total length of root，total surface area，average diameter，root volume，total free amino acid，proline and hydroxyproline content of 2 kinds of citrus seedlings were significantly decreased.In contrast，P.trifoliata was classified as efficient P type，while C.chuana inefficient P type.Outstanding performances of citrus germplasm adaptation to low phosphorus environment were increasing the ratio of root to shoot，decreasing the total length of root，total surface area，root volume，tips，total free amino acid and praline content to reduce P absorption，transfer efficiency and improve the efficiency of P utilization.This performance was particularly evident in the inefficient P type C.chuana.But the efficient P type P.trifoliata in low phosphorus environments could maintain normal tips，reduce root/shoot ratio and improve the P transfer efficiency.The content of hydroxyproline and P transfer efficiency were negatively correlated.

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Last Update: 2017-08-03