Variability of flowering and 2n pollen production in diploid potatoes under high temperatures

Kathleen G. Haynes, F. L. Haynes and William H. Swallow

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Abstract

Nine clones from a heat tolerant PHU-STN hybrid population were evaluated for flower production and percent normal, 2n and non-viable pollen under three temperature regimes at the Southeastern Plant Environmental Laboratories: 30/26, 26/22 and 22/18 C. No flowering was observed at 30/26 C. Flowering was irregular among seven of the clones at 26/22 C and 22/18 C. One clone produced numerous flowers at 26/22 C and 22/18 C. The plot of percent 2n pollen against time for this one clone under 22/18 C revealed a slope which was statistically different from zero but too small to be of practical value. The same plot of this clone under 26/22 C revealed a slope which was not statistically different from zero. Percent 2n pollen was statistically greater (at the 10% level of significance) in the 26/22 C chamber than the 22/18 C chamber.
Se evaluaron nueve clones de una población híbrida PHU-STN tolerante al calor para producción de flores y porciento de polen normal, 2n y no-viable, bajo tres regímenes de temperatura (30/26, 26/22 y 22/18°C), en los Laboratorios de Ambiente Vegetal del Sureste. No se observó floración a 30/26°C. La floración fué irregular, en siete de los clones, a 26/22°C y a 22/18°C. Un clon produjo numerosas flores a 26/22°C y a 22/18°C. El gráfico del porcentaje de polen 2n, en relación al tiempo, para este clon, bajo 22/18°C, reveló una pendiente que era estadísticamente diferente a cero, pero demasiado pequena para ser de valor práctico. La misma comparación, pero bajo 26/22°C, mostró una pendiente que no era estadísticamente diferente a cero. El porciento de polen 2n fue estadísticamente mayor (al nivel del 10%) en la cámara a 26/22°C que en la de 22/18°C.

Key Words  Potato - high temperature - regression - phytotron


Paper No. 10492 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC 27695-7601. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service of the products named, nor criticism of similar ones not mentioned. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby markedadvertisement solely to indicate this fact.

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