Improvement of Fruit Set in Eggplants With 4-Cpa (Tomatotone)

The effect of fruit-setting hormones applied at the stage of flowering on the morphological and physiological characteristics of eggplant (Solanum melongena L.) fruit during growth, maturation and storage

“…Ramanandan et al (1991) recorded the highest number of long-styled flowers by the application of growth regulator 1triacontanol (5 ppm). It has been reported that different varieties react positively to plant growth regulators, but not to the same degree (Van Ravestijn, 1983;Nothmann et al, 1983b;Sharma 2006). Nothmann et al, (1983b) found no difference in fruit-set among the three varieties, Black Oval, Pusa Purple Long and Pusa Purple Cluster, following treatments with 2,4-D at 2.5 mg l -1 , but final yield differed.…”

“…It is currently accepted that exogenous auxins play a significant role in fruit-set and development in several crops, e.g. eggplant (Olympios, 1978;Nothmann et al, 1983Nothmann et al, , 1975Van Ravestijn, 1983;Sharma, 2006;Nkansha, 2000), tomato (Sjut and Bangerth, 1982), pepper (Silveira et al, 1986;Thanopoulos 2012), strawberry (Thompson, 1969), mandarin (Guardiola and Azaro, 1987), pepino (Ercan and Akilli, 1996). The present results revealed that the application of growth regulators increased the mean individual fruit weight of all the eggplant cultivars of the present experiment, except Emi in the greenhouse.…”

“…These results are in contrast to other reports on the effect of 2,4-D treatments (under hot conditions), such as the formation of 'enlarged ovaries' and the restriction of the weight or size of the individual fruit (Muthukrishnan and Srinavasan, 1963;Matsumaru and Udagawa 1975). Van Ravestijn (1983) applied a spray mixture consisting of 20 mg l -1 4-CPA and 500 mg l -1 iprodion [3-(3,5-dichlorophenyl)-Nisopropyl-2,4-dioxoimidazolidine-1-carboxamide] or 500 mg l -1 vinchlozolin [3-(3,5dichlorophenyl)-5-methyl-vinyl-1,3-oxazolidine-2,4-dione] weekly to the flowers, and found earlier and higher yields through an increased number of fruit and higher mean fruit weight. Nothmann et al (1983b) found that treatments with 2,4-D improved the fruit set of basal and additional long-styled flowers which accounted for more than 90% of all fruit set but fruit-set in short-styled flowers was very low (8%); this indicated that fruit-set was more affected by style length than by flower position.…”

“…Gibberellins are not preservable in solution, moreover they increase plant elongation and reduce the rate of fruit ripening; for these reasons most experiments on fruit set have been conducted using auxins (Van Ravestijn, 1983). Nothmann and Koller (1973) stated that gibberellins caused irregularly developed (split) ovaries in eggplant flowers, even during the warm season when the autonomous occurrence of 'splitting' is rare; degeneration of corollas during the cool season was also enhanced by gibberellin application.…”

Η επίδραση του τρόπου καρπόδεσης της μελιτζάνας (Solanum melongena L.) σε δύο εποχές καλλιέργειας στην ποιότητα των άσπερμων και ένσπερμων καρπών κατά την ανάπτυξη και την αποθήκευση

“…Η επιλογή των πιο αποτελεσματικών ρυθμιστών ανάπτυξης, οι κατάλληλες συγκεντρώσεις και η συχνότητα εφαρμογής είναι πολύ σημαντικοί παράγοντες για την πρόκληση της καρπόδεσης και την ανάπτυξη του καρπού στη μελιτζάνα (Lee et al 2004). Επίσης, οι διαφορετικές ποικιλίες ανταποκρίνονται θετικά στους ρυθμιστές ανάπτυξης αλλά σε διαφορετικό βαθμό (Van Ravestijn 1983, Nothmann et al 1983b, Sharma 2006, Moniruzzaman et al 2014. Οι Nothmann et al (1983b) Ο van Ravestijn (1983) ψέκαζε τα άνθη κάθε εβδομάδα με ένα μείγμα αποτελούμενο από 4-CPA (20 mg l -1 ) και μυκητοκτόνο (iprodion ή vinchlozolin) (500 mg l -1 ) και κατέληξε σε υψηλότερες και πιο πρώιμες αποδόσεις μέσω του αυξημένου αριθμού των καρπών και του υψηλότερου μέσου βάρους των καρπών.…”