Abstract
Three hundred nineteen accessions of 59 tuber bearing species ofSolanum were screened for heat tolerance. The ability to produce shoot growth at high temperature (30 to 40 C) was tested initially. Since shoot growth is affected by tuberization, plants were grown at 18-h photoperiods to minimize tuber induction in all accessions. Fifty-one accessions of seven species were screened in three separate years to assess the stability of the estimates of heat tolerance. Shoot fresh weights at the high temperature were significantly correlated (r=0.7) from year to year, as were ratings for plant vigor at the high temperature (r=0.5).
Accessions that showed good shoot growth at the high temperature were screened again for tuberization under short days and high temperature (30 to 40 C). In general, tuberization was highly variable, but a few species and a few accessions showed consistent tuberization at 30 to 40 C.
Compendio
Se tamizaron 319 entradas de especies deSolanum formadoras de tubérculo, para tolerancia al calor. Inicialmente se probó la habilidad de generar el desarrollo de brotes a altas temperaturas. Desde que el desarrollo de brotes es afectado por la tuberización, las plantas se dejaron crecer a fotoperiodos de 18 horas para minimizar la inducción de formación de tubérculos en todas las entradas. Se tamizaron 51 entradas de siete especies, en tres años separados, para evaluar la estabilidad de los estimados de tolerancia al calor. Hubo una correlación significativa (r=0.7) de año a año en el peso fresco de los brotes a temperatura alta, así como también en los valores para vigor de la planta a temperatura alta (r=0.5).
Las entradas que mostraron un buen desarrollo a temperatura alta se tamizaron nuevamente para tuberización bajo condiciones de día corto y temperatura alta (30–40 C). En general, la tuberización fué altamente variable, pero unas pocas especies y unas pocas entradas mostraron tuberización consistente entre 30 y 40 C.
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Paper No. 866, Department of Vegetable Crops, Cornell University.
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Reynolds, M.P., Ewing, E.E. Heat tolerance in tuber bearingSolanum species: A protocol for screening. American Potato Journal 66, 63–74 (1989). https://doi.org/10.1007/BF02854425
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DOI: https://doi.org/10.1007/BF02854425