Título en español.

Abstract

Sarcotesta, sclerotesta, endosperm and embryo of fresh and old (0 and 3 years, respectively) seeds of the P.R. 6-65 and P.R. 8-65 papaya varieties were separately analyzed by paper chromatography to determine the presence of natural growth inhibitor that might be responsible for the reduction in germination of papaya seeds during storage. The results showed that in the innermost seed parts (embryo and endosperm) endogenous growth promoters were found while the outermost structures (sarcotesta and sclerotesta) contained inhibitors. Therefore, it is possible that the natural growth inhibitors of this seed might be minimized by removing the sarcotesta (the gelatinous envelope) of the seed, which contains the most endogenous growth inhibitors, plus a careful washing to eliminate the soluble inhibitors of the sclerotesta during the extraction of seeds from the fruits.

Evaluation of Phytotoxic Potential of Selected Plants Against Weeds

“…It was detected that maximum radicle length was observed for C. album, A. fatua and E. helioscopia. Similar, results were obtained in bioassays with lettuce seeds (Gherardi and Valio, 1976;Chow and Lin, 1991) and by Reyes et al (1980) with cucumber seeds. Chow and Lin (1991) used extracts of papaya, which showed that there is a higher concentration of inhibitors in the sarcotesta, canceling the germination of lettuce seeds, which had already been observed by Gherardi and Valio (1976).…”

Improving Germination of Papaya Seed by Density Separation, Potassium Nitrate, and Gibberellic Acid

“…Lange (5) reported that germination was accelerated after removing the sarcotesta and that a water-soluble extract from seeds inhibited germination. Reyes et al (7) also found inhibitors in the sarcotesta and seed coat.…”

“…A problem associated with seed propaga tion of papaya is poor germination (2,5,6). Several workers have isolated growth inhib itors from papaya seeds and have attributed sporadic germination to these substances (1,5,7). Lange (5) reported that germination was accelerated after removing the sarcotesta and that a water-soluble extract from seeds inhibited germination.…”

Effect of seed treatments on germination, growth and vigour of papaya (Carica papaya L.) cv. red lady

“…The seeds of papaya are enclosed within a gelatinous sarcotesta (aril, or outer seed coat which is formed from the outer integument.) which can prevent germination (Reyes et al, 1980) [15] . Before sowing of seeds is soaking in water or water soluable endogenous hormones has been reported to promote the germination.…”