Acclimatization to cold and frost-injury in canola

作者：Dalmago Genei Antonio^*; da Cunha Gilberto Rocca; Santi Anderson; Fernandes Pires Joao Leonardo; Muller Alexandre Luiz; Bolis Laise Maria

来源：Pesquisa Agropecuaria Brasileira, 2010, 45(9): 933-943.

DOI：10.1590/S0100-204X2010000900001

• Brassica napus
• thermal stress
• low temperature
• tolerance to cold

The objective of this work was to evaluate the influence of cold acclimatization on frost damage at different phenological stages of canola genotypes Five experiments were earned out under controlled conditions, in 2006, 2007, and 2008 The evaluated factors were genotypes, acclimatization (with, without), frost gradient, plant developmental stages, acclimatization regimes and frost regimes The evaluated variables were leaf scorching symptoms, dry weight, plant height, length of subperiod, yield components and grain yield The acclimatization before frost resulted in lesser leaf scorching symptoms and higher dry matter in comparison to plants not acclimated Frosts were harmful from -6 degrees C in early plant development stage, mainly in nanoacclimated plants, and from -4 degrees C at flowering, reducing the number of pods and the number of grains per pod Acclimatization after frost did not contribute to the tolerance of canola to frost Consecutive frosts caused no greater impairment to canola The canola acclimatization before frost reduces damage caused by it, mainly when the frost occur in the initial plant development stages

• 出版日期2010-9