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dc.typeArtigo de periódicopt_BR
dc.titlePhosphorus Deficiency Impairs Shoot Regrowth Of Sugarcane Varietiespt_BR
unicamp.authorRIBEIRO, R.V., Department of Plant Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazilpt_BR, F.C.B., Centro de Solos e Recursos Ambientais, Instituto Agronômico (IAC), P.O. Box 28, 13012-970 Campinas, SP, Brazilpt, E.C., Centro de Ecofisiologia e Biofísica, Instituto Agronômico (IAC), P.O. Box 28, 13012-970 Campinas, SP, Brazilpt, J.C., Centro Avançado de Pesquisa Tecnológica do Agronegócio Cana, IAC, P.O. Box 206, 14001-970 Ribeirão Preto, SP, Brazilpt
dc.description.abstractThe 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. Copyright © Cambridge University Press 2016en
dc.relation.ispartofExperimental Agriculturept_BR
dc.publisherCambridge University Presspt_BR
dc.identifier.citationExperimental Agriculture. Cambridge University Press, p. 1 - 11, 2016.pt_BR
dc.description.provenanceMade available in DSpace on 2016-06-03T20:12:47Z (GMT). No. of bitstreams: 1 2-s2.0-84953204420.pdf: 365417 bytes, checksum: 4c2a7f2cfdd903cf776558b884d67994 (MD5) Previous issue date: 2016en
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