SIGNIFICANCE OF CORRELATION BETWEEN DURA lION OF JUVENILE PERIOD AND EACH OF HEIGHT, EARlLlNESS AND PRODUCTIVITY CHARACTERS FOR EARLY SELECTION IN THE OWN ROOTED HYBRID TE ~ROSE SEEDLINGS | ||||
| Journal of Plant Production | ||||
| Article 12, Volume 28, Issue 5, May 2003, Page 3791-3815 PDF (1.53 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.243298 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| B. A. Abdel-Maksoud, | ||||
| Oepartment of Floriculture, Faculty of Agriculture, Alexandria University, Alexandria, Egypt | ||||
| Abstract | ||||
| Two successive experiments were set up using stratified seeds collected from a population of 2 and 3 years old-plants of Hybrid Tea-rose (Rosa hylirida, L.cv. KardinaQ. Each experiment continued for 3 years in glasshouses. Seeds were sown in plastic trays. individually transplanted In the cotyledon stage into 20 em dia!'1eter clay pots and left until the time of the apical flower bud appearance. According td this time, seedlings were divided into 12 and 11 categories in the 111 and 2nd experiments; respectively. and planted in ground beds. The number of days from gerrrination to flower bud appearance is defined as juvenile period. The relations between juvenile period and some vegetative and flowering characters in the own rooted seedlings were studied. One year Old-seedlings. varying in juvenile periods, were budded on a rootstoclc Rosa canina. Lcv. lnermis and the grafted plants were plantet( in ground beds. The relations between some characters of the own rooted seedlings.land those of the grafted plants were studied for 2 years. The results of the two expert ents can be summarized as follows: 1- The leaf number at the flower bud appearance was 7 leaves. 2- The own rooted seedlings with short juvenile periods had shorter heigtits at both times of flower bud appearance and first flowering, flowered eartier and produced more flowers than those with tong juvenile periods. Significa~t positive correlations were detected between the duration or the juvenile perio~ and each of the height of the own rooted seedlings at flower bud appearance, the height at first flowering either for the own rooted seedlings or for the 1 year Old-grafted plants and ftowering time or the own root.ed seedlings. Also, significant positive correlations were found between the own rooted seedlings height at flower bud appearance and their height at first flowering. 3- Significant negative correlations were found between the juvenile peri?d and the flower yield o( the rmn rooted seedlings. At first flowering, there wer significant positive correlations between the height of the own rooted seedlin s and their height on a rootstock. 4- There were significant positive correlations between the flower yield of the 1 year old-own rooted seedlin,is and their yield in the 2nd year and also eir yield in each of the 1 II and 2 year after grafting. The same situations we~e recorded between the flower yield of the 2 years oId-own rooted seedlings and that o( the grafted plants either in the 1" or in the 2td year after grafting. The flower yield of the 1 year old-grafted plants and that of the 2 years old-grafted ones were positively correlated. 5- " was clear Ihatthe juvenile period depends on the plant developme t and does not control thi, process. The relations between the juvenile period and the studied characters of the own rooted seedlings were probably largely inherent and remained valid for the grafted plants. Selection was carried out firstly fo~ short juvenile period thai means for early flowering, secondarily (or long heigh and at the end for flower yield. The obtained results were discussed. | ||||
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