Base temperature, plastochron and final node number in yellow calendula

Ciência Rural

Fagundes, Joelma Dutra¹  Streck, Nereu Augusto¹  Reiniger, Lia Rejane Silveira¹  Storck, Lindolfo¹  Kruse, Nelson Diehl¹ 

[1] Universidade Federal de Santa Maria, Santa Maria, Brasil

关键词: degree-day;    development;    Aspilia montevidensis;    thermal time;   

DOI  :  10.1590/S0103-84782008005000021

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

Yellow calendula (Aspilia montevidensis) is a perenium herbaceous plant native of South and Southeast Brazil that has been little studied about its biology. The objective of this study was to determine the base temperature, the plastochron and the final node number in A. montevidensis. An experiment was conducted in Santa Maria, RS, with six planting dates (12/20/2005, 02/14/2006, 03/06/2006, 04/04/2006, 05/05/2006 and 06/08/2006). The experimental design was completely randomized and the experimental unit was one plant grown in pots filled with commercial substratum. The number of visible nodes were measured on the maim stem and on first and second order lateral branches. The base temperature for node appearance was estimated with the mean square error approach. The daily thermal unit was calculated from transplanting and the plastochron (°C day for the appearance of two successive nodes) was estimated for each stem. The estimated base temperature for node appearance in A. montevidensis was 0°C. Plastochron and final node number (FNN) vary among stems and planting dates, with the lowest plastochron and the greatest FNN on the MS.

【 授权许可】

CC BY-NC