Abstract
Moisture stressing of potato plants resulted in reduced14CO2 fixation and translocation of labelled photosynthates from leaves to tubers. A majority of the label was recovered in the sugar fraction of both leaves and tubers. The amount of labelled14C recovered in the organic acid fraction of tubers of normally irrigated plants was significantly higher than in tubers which had been moisture stressed. In the other fractions, the differences were not significantly different. Injection of uniformly labelled sucrose into the basal portion of attached tubers of stressed and non-stressed plants showed greater translocation of labelled carbon by tubers of stressed plants from basal to the apical portion and also into the stems as compared to non-stressed plants.
Resumen
El stress de humedad en plantas de papa, resultó en la reducción de la fracción azúcares tanto de hojas como tubérculos. La cantidad de14C hojas a los tubérculos. La mayoría del marcado fué recuperado en la fracción azúcares tanto de hojas como tubérculos. La cantidad de14CO marcado, recuperado en la fracción orgánica ácida de tubérculos provenientes de plantas normalmente irrigadas, fue significativamente mayor que en aquellos tubérculos que habían sufrido un stress de humedad. En las otras fracciones, particularmente en la porción aminoácido, las diferencias fueron no significativas. El inyectado de sacarosa uniformemente marcada en la porción basal de tubérculos agregados de plantas bajo stress y plantas con stress mostró una mayor translocación de carbono marcado en los tubérculos de plantas bajo stress desde la parte basal a la porción apical y también dentro de los tallos, al ser comparada con plántulas sin stress.
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Scientific paper No. 5220. College of Agriculture Research Center, Washington State University, Pullman, WA 99164. Project 1949. Financed in part by a grant from the following processing companies: Carnation, Rogers Walla Walla, Pride Pak Foods, Inc., Chef Reddy and Twin City Foods.
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Shekhar, V.C., Iritani, W.M. Influence of moisture stress during growth on14CO2 fixation and translocation inSolanum tuberosum L.. American Potato Journal 56, 307–311 (1979). https://doi.org/10.1007/BF02855599
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DOI: https://doi.org/10.1007/BF02855599