Climate change and its effects on cassava crop/ Mudanca climatica e seus efeitos na cultura da mandioca

The objective of this review is to ensemble information from the literature on the response of cassava to climate change. The growth rate of the most plants increases at elevated C[O.sub.2] because it is the substrate for photosynthesis, however, the increase in temperature may offset the benefits o...

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Published in:Revista brasileira de engenharia agrícola e ambiental 2014-01, Vol.18 (1), p.90
Main Authors: Gabriel, Luana F, Streck, Nereu A, Uhlmann, Lilian O, da Silva, Michel R, da Silva, Stefania D
Format: Article
Language:Spanish
Subjects:
Environmental aspects
Food supply
Global temperature changes
Photosynthesis
Plant biochemistry
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Summary:The objective of this review is to ensemble information from the literature on the response of cassava to climate change. The growth rate of the most plants increases at elevated C[O.sub.2] because it is the substrate for photosynthesis, however, the increase in temperature may offset the benefits of C[O.sub.2] on crop productivity due to a shortening of the cycle and increase in respiration of maintenance. Results from greenhouse, field and numerical experiments indicate that the response of cassava crop to elevated C[O.sup.2] is positive, i.e. the increase in atmospheric C[O.sub.2] results in increase of storage root yield of cassava. The increase in temperature projected in future climate scenarios in general should not decrease storage root yield of cassava, mainly in Africa, where this crop has an important role on food security. Further studies should be made using the current knowledge in order to confirm previous studies on the response of cassava to elevated C[O.sub.2] and temperature in regions where few studies have been conducted, like in Brazil. Key words: Manihot esculenta greenhouse effect global warming food production food security O objetivo nesta revisao e reunir informacoes da literatura quanto a provavel resposta da cultura da mandioca a mudanca climatica. Na maioria das plantas a taxa de crescimento tende a aumentar com a elevacao da concentracao de C[O.sub.2] atmosferico, visto que o C[O.sub.2] e o substrato para fotossintese. Porem o aumento da temperatura do ar podera anular os efeitos beneficos do C[O.sub.2] na produtividade das culturas, em virtude do encurtamento do ciclo e do aumento da respiracao de manutencao. Resultados de experimentos em casa de vegetacao, a campo e numericos, indicam que a resposta da planta de mandioca ao aumento de C[O.sub.2] e positiva, ou seja, o aumento do C[O.sub.2] atmosferico resulta em aumento na produtividade de raizes tuberosas de mandioca. O aumento de temperatura projetada em cenarios climaticos futuros nao deve, em geral, diminuir a produtividade de raizes tuberosas de mandioca, especialmente na Africa, onde esta cultura tem papel fundamental na seguranca alimentar. Novos estudos devem ser realizados com base no conhecimento atualizado para confirmar estudos anteriores sobre a resposta da cultura da mandioca ao aumento do C[O.sub.2] e temperatura em regioes ainda pouco estudadas, como o Brasil. Palavras-chave: Manihot esculenta efeito estufa aquecimento global producao de alimentos seguranca
ISSN:1415-4366