Given the worldwide effort to improve crop phosphorus (P) efficiency, it is important to understand the adaptive
strategies of crops with different root types and properties under limited P availability. The present study
examined root morphological and physiological responses of two graminoids (wheat and maize), and three le-
gumes (soybean, white lupin and narrow-leafed lupin) to low P supply under two difference growth conditions.
Two experiments using non-destructive root observation systems (Expt.1, semi-hydroponic system; Expt.2, rhi-
zoboxes) were conducted under low P (Expt.1: 2 μ M; Expt.2: 9 mg kg −1 soil) and optimal P (Expt.1: 200 μ M; Expt.
2: 60 mg kg −1 soil). Plants were assessed 40 days after transplanting (Expt. 1) and 35 days after sowing (Expt. 2).
Results showed that low P stress generally suppressed plant shoot and root growths of all crops and significantly
increased root-shoot ratio in graminoid plants in both experiments. Root length vertical distribution in each 10
cm layer was relatively lower in low P than in optimal P treatments with the majority roots distributed in 10–40
cm layers in both experiments. Under low P, all plants accumulated significantly less P in plant tissues. Maize,
soybean and white lupin plants had larger dry weights and P contents than wheat and narrow-leaf lupin under
respective P treatment under both experiments except high P content in wheat cv Zhongyu 6 under optimal P in
Expt. 2. Low P stress significantly increased plant P-use efficiency in both experiments with more profound
increase in maize and white lupin in Expt. 1. Low P stress stimulated cluster roots formation in white lupin. Both
lupin species had significantly higher rhizosheath acid phosphatase activity than other crops under low P supply.
In conclusion, five crop species differed in their adaptive strategies to low P availability. Graminoid species had
strong response by modifying their root morphology while legumes especially lupin species used the limited P
more efficiently through enhancing rhizosheath acid phosphatase activity to cope with soil P deficit.
1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, and Northwest A&F University 2.University of the Chinese Academy of Sciences
推荐引用方式 GB/T 7714
Aijiao Wu,Yan Fang,Shuo Liu. Root morphology and rhizosheath acid phosphatase activity in legume and graminoid species respond differently to low phosphorus supply[J]. Rhizosphere,2021,19(1):1-13.
APA
Aijiao Wu,Yan Fang,&Shuo Liu.(2021).Root morphology and rhizosheath acid phosphatase activity in legume and graminoid species respond differently to low phosphorus supply.Rhizosphere,19(1),1-13.
MLA
Aijiao Wu,et al."Root morphology and rhizosheath acid phosphatase activity in legume and graminoid species respond differently to low phosphorus supply".Rhizosphere 19.1(2021):1-13.
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