El-Torky,, M., Shahein, A., EI-Shennawy, O., EI-Fadly, E. (2004). STUDIES ON JOJOBA [Simmondsia chinensis (LINK) SCHNEIDER]: .• 11- STUDIES ON SOME VEGETATIVE AND FLOWERING CHARACTERISTICS.. Journal of Plant Production, 29(12), 7201-7215. doi: 10.21608/jpp.2004.238956
M. G. El-Torky,; A. H. Shahein; Ola A. EI-Shennawy; Eman M. EI-Fadly. "STUDIES ON JOJOBA [Simmondsia chinensis (LINK) SCHNEIDER]: .• 11- STUDIES ON SOME VEGETATIVE AND FLOWERING CHARACTERISTICS.". Journal of Plant Production, 29, 12, 2004, 7201-7215. doi: 10.21608/jpp.2004.238956
El-Torky,, M., Shahein, A., EI-Shennawy, O., EI-Fadly, E. (2004). 'STUDIES ON JOJOBA [Simmondsia chinensis (LINK) SCHNEIDER]: .• 11- STUDIES ON SOME VEGETATIVE AND FLOWERING CHARACTERISTICS.', Journal of Plant Production, 29(12), pp. 7201-7215. doi: 10.21608/jpp.2004.238956
El-Torky,, M., Shahein, A., EI-Shennawy, O., EI-Fadly, E. STUDIES ON JOJOBA [Simmondsia chinensis (LINK) SCHNEIDER]: .• 11- STUDIES ON SOME VEGETATIVE AND FLOWERING CHARACTERISTICS.. Journal of Plant Production, 2004; 29(12): 7201-7215. doi: 10.21608/jpp.2004.238956
STUDIES ON JOJOBA [Simmondsia chinensis (LINK) SCHNEIDER]: .• 11- STUDIES ON SOME VEGETATIVE AND FLOWERING CHARACTERISTICS.
1Department of Floriculture, Ornamental Horticulture and Garden Design, Faculty of Agriculture, Alexandria University, Egypt.
2Department of Pomology, Faculty of Agriculture, Alexandria University, Egypt.
Abstract
Plant height, the number of main branches per plant, time of sex differentiation, habit of flowering as well as fruiting pattern and yield were studied using different jojoba clones of about 20 years old. Data showed that: 1- Plant height of the progeny of SF1 attained the highest values after 36-months, followed by SF3 then TF7. The differences between the three progenies seemed to be a genetically trait. However, the environmental conditions might also have a slight effect on p < /span>lant height. Consequently, the progeny population of SF1 proved to be highly stable against the seasonal variations, whereas both SF3 and TF7 have slightly reacted with the seasonal variations. 2- With respect to the number of main branches per plant, it was found that the progeny population of SF3 obviously attained the highest values of main branches at 36 months. The extensive branching of SF3 appeared clearly in the three seasons as compared with that of both SF1 and TFt regardless the seasonal effect. 3- As for the time of sex differentiation, the data showed that, among a population of 2650 young plants of jojoba grown under greenhouse conditions (13 months-old), only 3.7% of the plants commenced flowering and this percentage increased gradually during the second year to be 25.32% (24 months old plants). Moreover, the time of flowering varied widely among plants. On the other hand, the number of male jojoba plants which commenced flowering was always greater than the number of females. 4- In male and female shrubs of the studied jojoba clones, flowers usually develop at every other node which was found to be the common habit of flowering of all the studied males; SM1, SM2 and SM3, and only one of the three studied females; SF4. Flowers develop at every node in two females; SF1 and SF3. All the studied shrubs tended to produce both types of flowering habit on the same shrub, but only one type was always clearly dominant. The habit of flowering appears to be p < /span>rimarily under genetic control which may be modified by environmental conditions. 5- The common fruiting pattern in the studied jojoba females was that of a single fruit. In addition, the percentage of fruits with single, double and triple seeds varied from 90.37 to 96.00% , 3.94 to 9.12% and 0.00 to 0.51%; respectively. Clear differences were found between clones. As an average for the three years, the clone SF3 proved to give the highest yield of fruits. Moreover, the yield of the selected clones varied greatly between shrubs as well as between years. Clone SF3 attained the same attitude of fruits and produced the highest yield in the three years of study, with an average of 2258.33 gram per plant as compared with that of SF1 (433.33 g \ plant.) and SF2 (178.33 g \ plant.). The seasonal performance of clones differed greatly as well.
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