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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

PHOSPHORUS DEFICIENCY IMPAIRS SHOOT REGROWTH OF SUGARCANE VARIETIES

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Author(s):
Bachiega Zambrosi, Fernando C. ; Ribeiro, Rafael Vasconcelos ; Machado, Eduardo Caruso ; Garcia, Julio Cesar
Total Authors: 4
Document type: Journal article
Source: EXPERIMENTAL AGRICULTURE; v. 53, n. 1, p. 1-11, JAN 2017.
Web of Science Citations: 3
Abstract

The shoot regrowth vigour of sugarcane varieties having contrasting phosphorus (P) efficiency was evaluated under varying soil P availability. The P-inefficient (IAC91-1099 and IACSP94-2101) and -efficient (IACSP94-2094 and IACSP95-5000) sugarcane varieties were grown under low (25 mg P kg(-1) soil) or high (400 mg P kg(-1) soil) P supply at planting. After 90 days (first cycle of growth), the shoots were harvested and regrowth was studied 70-75 days later by evaluating photosynthesis, leaf area formation, biomass production and P uptake. The shoot dry matter (DM) of sugarcane regrowth subjected to a low P supply was genotype-dependent, with the P-efficient varieties exhibiting greater values than the inefficient ones. This result was explained by the greater efficiency of IACSP94-2094 and IACSP95-5000 in acquiring P rather than P utilization efficiency for shoot biomass production. The root P stored during the first cycle of growth would represent only a minor fraction (< 20%) of the total P content in the shoots at the end of the regrowth period. Thus, we argue that the improved shoot P uptake of the P-efficient varieties was related to their ability to sustain P acquisition after harvesting rather than to the remobilization of root P reserves. Moreover, our data revealed that net CO2 assimilation per leaf area was not associated with differential performance among varieties under P deficiency, suggesting a more critical role of total leaf area in photosynthate supply for sugarcane regrowth. In conclusion, sugarcane regrowth is improved in P-efficient varieties under P deficiency conditions, a finding of practical relevance as such ability might benefit the productivity and the longevity of sugarcane ratoons in low P tropical soils. (AU)

FAPESP's process: 11/18446-0 - Phosphorus use efficiency of sugarcane varieties
Grantee:Fernando César Bachiega Zambrosi
Support Opportunities: Regular Research Grants