STUDIES ON JOJOB S A [Simmondsia chinensis (LINK) CHNEIDER]: .• .IV. PR~~U~\AI!~I~~ SEX IDENTIFICATION | ||||
| Journal of Plant Production | ||||
| Article 18, Volume 29, Issue 12, December 2004, Page 7229-7240 PDF (3.19 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2004.238958 | ||||
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| Authors | ||||
| M. G. El-Torky,1; A. H. Shahein2; Ola A. EI-shennawy1; Eman M. EI-Fadly1 | ||||
| 1Dep~rtment of Floriculture, Ornamental Horticulture and Garde" DesIgn, Faculty of Agriculture, Alexandria University, Egypt. | ||||
| 2Dept. of Pomology, Fac. of Agric., Ale..<andria University, Egypt. | ||||
| Abstract | ||||
| For the prediction of jojoba seedling sex before flowering, some leaf shape parameters and indices were measured and calculated from known sex population of jojoba. Leaf shape indices included the basic parameters of leaf blade length (L), blade width at its one-fourth point from the base (W1), blade width at its widest region rNO) and the blade width at its three-fourth point from the base (W2) in addition to six suggested derived ratios which included: LfWO, W1/L, WO/L, W21L, 2W1/L and 2W2/3L. It was statistically found that only six out of the 10 selected leaf parameters could be used for the identification of jojoba seedling sex (L, W2, WO, W1, W1/L and 2W~/L). The standard values of leaf parameters of jojoba shrubs indicated the possibility of using leaf morphological parameters to identify male and female jojoba plants. Preflowering sex identification was carried out using three methods: 1- Preflowering sex identification by the confidence limits comparisons; the confidence limits of the different leaf parameters of the standard known sex jojoba shrubs were first calculated, data of the unknown seedlings were compared with the confidence limits of the standard known sex population. Generally, it was found that the different leaf parameters were able to identify the seedling sex of a limited portion of the population size, not more than 21.52% in the case of 2W1/L. 2- Preflowering sex identification by the overall mean comparisons; Since the means of males were always smaller than females, the seedling mean of any parameter was compared to the corresponding standard overall mean of that parameter. It was generally found that the different leaf parameters were able to identify successfully the sex of about 53% (W1/L) to almost 66% (W1) of the unknown population of jojoba seedlings. 3- Preflowering sex identification by the multiple separation method; it was possible by using the multiple separation method to identify accurately and high reliably the sex of 70 unknown jojoba seedlings (44.30% of the tested population), 22 males and 48 females. Finally It can be strongly recommended to use the overall mean comparisons not only due to its extremely easy way of calculations but also to the highly accurate results of sex identification as well as the high percentage of identified seedlings obtained. | ||||
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