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Kochia (Kochia scoparia) Pollen Dispersion, Viability and Germination

Published online by Cambridge University Press:  12 June 2017

Dawit Mulugeta ,
Bruce D. Maxwell ,
Peter K. Fay  and
William E. Dyer
Dawit Mulugeta
Affiliation:
Plant, Soil and Environmental Sci. Dep., Montana State Univ., Bozeman, MT 59717-0312
Bruce D. Maxwell
Affiliation:
Plant, Soil and Environmental Sci. Dep., Montana State Univ., Bozeman, MT 59717-0312
Peter K. Fay
Affiliation:
Plant, Soil and Environmental Sci. Dep., Montana State Univ., Bozeman, MT 59717-0312
William E. Dyer
Affiliation:
Plant, Soil and Environmental Sci. Dep., Montana State Univ., Bozeman, MT 59717-0312
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Abstract

Kochia pollen dispersion was measured during 24 and 48 h periods from a kochia population in an 8- by 10-m area in the center of a 1.6 ha fallow field. Pollen counts from traps at 50- and 100-cm heights declined rapidly with increasing distance from the pollen source. Pollen deposition was highest along the prevailing wind direction: up to 23 pollen grains cm–2 were recovered 50 m from the pollen source along the southeast (SE) vector. Nonlinear regression analysis of pollen deposition along the SE vector was used to estimate that 99.9% of shed pollen would be deposited within 154.4 m of the source. Viability of pollen from greenhouse- and field-grown plants was measured using staining and germination assays. of four pollen stains tested, only 1,2,3-triphenyl tetrazolium chloride gave consistent results and did not stain heat-killed pollen. Depending on environmental conditions, kochia pollen remained viable from less than 1 d to 12 d. Length of kochia pollen viability was shortest under high temperatures (22 and 28 C) and low relative humidity (7 and 32%). Less than 0.5% germination was observed in 1.1% agar media with various additions; however, up to 17.8% germination was observed after incubation at 28 C in 100% relative humidity.

Keywords

Kochia, Kochia scoparia (L.) Schrad # KCHSCKochia scoparia (L.) Schradpollen viabilitypollen germinationpollen dispersiontetrazolium stainingherbicide resistanceKCHSC
Type
Weed Biology and Ecology
Information
Weed Science , Volume 42 , Issue 4 , December 1994 , pp. 548 - 552
Copyright
Copyright © 1994 by the Weed Science Society of America 

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