Frost damage to canola (Brassica napus L.) during reproductive phase in a controlled environment.

This study evaluated frost-related damage and benefits of cold acclimation during the reproductive phase in canola. Plants were exposed to cold acclimation and frost simulation at the start of flowering, during full flowering, and at the start of grain filling. The following were evaluated: plant mortality, number of viable ovules and silique abortion, floral buds and flowers, number of silique grains, total plant dry matter, number of siliques, total silique abortion, and grain dry matter. Frost caused death in non-acclimated plants and increased abortion in siliques, floral buds, and flowers, thus reducing silique and grain dry matter content. Frost mostly prevented the development of embryos in the siliques, but viable ovules were found in the floral buds and flowers. During their reproductive phase, canola plants have only a limited ability to increase their tolerance to frost damage. Nonetheless, siliques originating from the floral buds and open flowers contained a higher number of grains than siliques after frost exposure. Therefore, from the start of flowering to the start of grain filling, floral buds and flowers are responsible for producing most of the grain dry matter when there is frost occurrence.

Bibliographic Details

Main Authors:	KOVALESKI, S., DALMAGO, G. A., GOUVEA, J. A. de
Other Authors:	Samuel Kovaleski, Universidade Federal de Santa Maria, Centro de Ciências Rurais. Avenida Roraima, 1000, Bairro Camobi, CEP 97105- 900 Santa Maria, RS, Brazil. E-mail:samtotes@hotmail.com and arnob.heldwein@pq.cnpq.b; GENEI ANTONIO DALMAGO, CNPT; JORGE ALBERTO DE GOUVEA, CNPT.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2020-03-13
Subjects:	Freezing tolerance, Cold acclimation, Freezing damage, Air temperature,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1121228
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