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Effect of Light on Growth and Development of Field Bindweed (Convolvulus arvensis) and Russian Knapweed (Centaurea repens)

  • Armando A. Dall'Armellina (a1) and Robert L. Zimdahl (a2)

Abstract

Field bindweed and Russian knapweed were grown from seed or rhizome segments under 520, 325, or 236 μmol·m–2 · s–1 photosynthetic photon flux density (PPFD) to determine vegetative and reproductive response. Flower production in both species declined with decreasing light level. Leaf area of field bindweed decreased as light level decreased, but Russian knapweed leaf area increased as light intensity decreased from 520 to 325 μmol·m–2 ·s–1 PPFD or from 520 to 236 μmol·m–2 ·s–1. Dry matter of shoots, roots, and rhizomes of field bindweed grown from seed declined as light level decreased, but the only response of plants grown from rhizome segments was complete inhibition of rhizome production. Dry matter of Russian knapweed shoots and roots in plants grown from seed or rhizome segments decreased as light decreased. In both species the total PPFD was more important than whether low or high light level occurred first.

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Keywords

Effect of Light on Growth and Development of Field Bindweed (Convolvulus arvensis) and Russian Knapweed (Centaurea repens)

  • Armando A. Dall'Armellina (a1) and Robert L. Zimdahl (a2)

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