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Effects of Photoperiod and Temperature on Root Bud Development and Assimilate Translocation in Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  12 June 2017

Ray S. McAllister
Affiliation:
Dep. Plant Path., Seed and Weed Sci., Iowa State Univ., Ames, IA 50011 Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
Lloyd C. Haderlie
Affiliation:
Aberdeen Res. and Ext. Center, Univ. of Idaho, Aberdeen, ID 83210 Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583

Abstract

Adventitious root bud development and assimilate translocation were studied in Canada thistle [Cirsium arvense (L.) Scop. ♯ CIRAR] grown in nutrient solution in controlled environments using combinations of two photoperiods (PP) (13 and 15 h), three day/night shoot temperatures (ST) (15/5, 25/15, and 30/22 C), and three root temperatures (RT) (10, 20, and 30 C). Total root bud elongation increased with RT and length of PP and was greatest (65 cm/plant) at 25/15 C ST, 15-h PP, and 30 C RT. The number of root buds produced was greatest at 20 C RT (7.3 to 10.3 buds/plant), whereas variations in PP and ST had little effect. Total dry-matter production was greatest (7.2 g/plant) at 15-h PP, 30/22 C ST, and 20 C RT. To study phloem translocation, photoassimilates were labeled in Canada thistle plants by exposing mature leaves to 14CO2. Net assimilate translocation from a source leaf following 24-h temperature acclimation was affected little by RT and ST, but was greater under the 13-h PP than under the 15-h PP. After 7 days of temperature preconditioning, net translocation of 14C-assimilates increased with both RT and ST, but no effects due to PP were noted. With 24-h temperature acclimation, net assimilate accumulation in roots was enhanced by 13-h PP and low ST (15/5 C), whereas RT itself had no effect. In temperature-preconditioned plants, 10 C RT enhanced assimilate accumulation in roots, but ST and PP had no effect.

Type
Physiology, Chemistry, and Biochemistry
Copyright
Copyright © 1985 by the Weed Science Society of America 

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