Forced Pollen Shedding Effects on Pollen Diameter and Early Seedling Growth in Maize
In those crops such as maize, which have been improved for many generations by man, the effectiveness of pollen genotype selection would be decreased each generation because the usual improvement procedure involves pollination with excess quantities of fresh pollen released normally under field conditions. In these crops, variation in this standard pollination scheme may amplify existing pollen transmission differences so that the effectiveness of pollen genotype selection would be enhanced. In maize, such changes as extended pre-pollination mature pollen storage at 2°C and pre-pollination sty1ar treatments with various chemicals increased pollen transmission differences at both qualitative and quantitative loci (Pfahler 1974b, 1986, Pfahler et a1. 1986a,b). Under field conditions, attached maize tassels usually shed pollen daily between 800-1200 h, with all or most of the pollen grains in the tassel released in 7-10 days. Detached tassels with their cut ends submerged in water and exposed to low light intensity high humidity, and 25–30°C, shed pollen continuously, with all or most of the pollen grains in the tassel released in three days.
KeywordsShoot Length Collection Period Single Cross Coleoptile Length Early Seedling Growth
Unable to display preview. Download preview PDF.
- Pfahler PL (1974b) Fertilization ability of maize (Zea mays L.) pollen grains. IV. Influence of storage and the alleles at the shrunken, sugary and waxy loci. In: Linskens HF (ed) Fertilization in higher plants. North-Holland, Amsterdam, p 15Google Scholar
- Pfahler PL, Mulcahy DL, Barnabas B (1986a) The effect of forced shedding on pollen traits, seedsetting, and transmission at various maize (Zea mays L.) endosperm mutant loci. Acta Bot Neerl 35:195–200Google Scholar
- Pfahler PL, Mulcahy DL, Barnabas B (1986b) The effect of pre-pollination stylar treatments on seed set and pollen transmission at various maize (Zea mays L.) endosperm mutant loci. Acta Bot Neerl 35:201–207Google Scholar
- Snedecor GW (1956) Statistical methods. 5th edn. Iowa State University Press, Ames, IowaGoogle Scholar
- Whaley WG (1952) Physiology of gene action in hybrids. In: Gowen JW (ed) Heterosis. Iowa State University Press, Ames, Iowa, p 98Google Scholar