Kochia (Kochia scoparia) Pollen Dispersion, Viability and Germination

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.

[1]  L. Lass,et al.  Plant Movement and Seed Dispersal of Russian Thistle (Salsola iberica) , 1995, Weed Science.

[2]  Peng W. Chee,et al.  Rapid Germination of Sulfonylurea-Resistant Kochia scoparia L. Accessions is Associated with Elevated Seed Levels of Branched Chain Amino Acids , 1993, Weed Science.

[3]  W. Morris.  Predicting the Consequence of Plant Spacing and Biased Movement for Pollen Dispersal by Honey Bees , 1993 .

[4]  R. Manasse.  Ecological Risks of Transgenic Plants: Effects of Spatial Dispersion on Gene Flow. , 1992, Ecological applications : a publication of the Ecological Society of America.

[5]  J. Cherfas.  Transgenic Crops Get a Test in the Wild , 1991, Science.

[6]  P Kareiva,et al.  Quantifying the spread of recombinant genes and organisms. , 1991, Biotechnology.

[7]  Dawit Mulugeta.  Management, inheritance, and gene flow of resistance to chlorsulfuron in Kochia scoparia L. (Schrad) , 1991 .

[8]  R. Pieper,et al.  Allelopathic effects of kochia on blue grama. , 1987 .

[9]  A. F. Wiese,et al.  The Effects of Temperature and Rainfall on Emergence and Growth of Eight Weeds , 1985, Weed Science.

[10]  P. M. Harney,et al.  Pollen Viability in Rosa , 1984, HortScience.

[11]  S. S. Lee,et al.  Pollen stigma interactions and intercellular recognition in Brassica: pathways for water uptake , 1983 .

[12]  A. Dhawan,et al.  Effect of Growth Regulators and Light on Pollen Germination and Pollen Tube Growth in Pinus roxburghii Sarg , 1981 .

[13]  M. P. Alexander.  A versatile stain for pollen fungi, yeast and bacteria. , 1980, Stain technology.

[14]  D. Levin,et al.  Gene Flow in Seed Plants , 1974 .

[15]  O. Burnside,et al.  Germination and Seedling Development of Common Milkweed and Other Species , 1972, Weed Science.

[16]  E. Schweizer,et al.  Competition Between Kochia and Sugarbeets , 1969, Weed Science.

[17]  J. M. Bell,et al.  PRELIMINARY EVALUATION OF RUSSIAN THISTLE, KOCHIA, AND GARDEN ATRIPLEX AS POTENTIAL HIGH PROTEIN CONTENT SEED CROPS FOR SEMIARID AREAS , 1969 .

[18]  J. Brewbaker.  THE DISTRIBUTION AND PHYLOGENETIC SIGNIFICANCE OF BINUCLEATE AND TRINUCLEATE POLLEN GRAINS IN THE ANGIOSPERMS , 1967 .

[19]  R. Kohel,et al.  Evaluation of Seven Tetrazolium Salts as Vital Pollen Stains in Cotton Gossypium hirsutum L.1 , 1964 .

[20]  J. Brewbaker,et al.  THE ESSENTIAL ROLE OF CALCIUM ION IN POLLEN GERMINATION AND POLLEN TUBE GROWTH , 1963 .

[21]  J. Edwardson,et al.  Asexual transmission of cytoplasmic male sterility. , 1961, Proceedings of the National Academy of Sciences of the United States of America.

[22]  Pollen Grains: , 1936, Nature.

[23]  M. Kellerman.  SUCCESSFUL LONG-DISTANCE SHIPMENT OF CITRUS POLLEN. , 1915, Science.