EFFECT OF SOME CHEMICALS AND GROWTH REGULATORS ON THE MORPHOLOGICAL AND THE HISTOLOGICAL STAGES OF THE TERMINAL FLOWERY BUD IN SOME MANGO CULTIVARS | ||
| Journal of Plant Production | ||
| Article 15, Volume 29, Issue 6, June 2004, Pages 3433-3461 PDF (4.4 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2004.238664 | ||
| Author | ||
| M. H. Abd EI-Zaher, | ||
| Pomology Department - Faculty of Agriculture -Cairo University | ||
| Abstract | ||
| This study was carried out during seasons of 1999,2000 and 2001 on four mango cultivars (Hindy Sinnara, Dabsha, Zebda and Ewais) in 'on' and 'off years through the period of September - February. Data were indicated that the morphological and histological stages in aU studied cultivars were similar in 'on' and 'off-year of the two studied seasons whith some slowly and delay in these stages in 'off-year season. The sludied cultivars and treatments had significant effect on the beginning time and period of both the histological and the morphological stages in all studied cullivars and the percentage of the terminal flowery buds; the studied cultivars were affected differenUy by the studied treatments in respect of earliness or delaying the flowering. The percentaqe of the terminal flowery buds in 'on'· year season was more than that of 'off· year season. Also, the studied cultivars were great differed in the number and the histological features of these stages in all studied cultivars. Four morphological stages were determined as follows: fully swollen bud, bud inception, developing panicle prior to fun bloom and fuUy developed panicle at full bloom. Hindy Sinnara cultivar have nine stages (bud primordium, scales initiation, nat flowery bud, slightly dome- shaped flowery bud, dome- shaped flowery bud, stamens and carpel primordia, differentiation of stamens and carpel, differentiation of the upper part of carpel and differentiation of the lower part of carpel): Zebda cullivar have eight stages (flat flowery bud, pre-dome-shaped flowery bud, slightly dome-shaped flowery bud, dome- shaped flowery bud, stamens primordia initation. carpel initiation, closed differentiated flowery bud and developed ovary): Ewais cultivar have eight stages (appearance of active tissues, conical- shaped bud, rounded bud, conical like- s'haped grown apex, developed floral leaves, stamens and carpel primordia, differentiated bud and pre- burst bud) and Dabsha cultivar have five stages (undifferentiated bud, Slight probus.on, active bud, early differentiation and axillary floral bud initiation). In most cases. the treatments of urea and its combinations caused buming of scales and another parts of the terminal flowery bud; treatment of paclobutrazole caused excessive differentiation of scales, NAA, SA and GA3 treatments caused some of upnormal initiation and differentiation in the terminal flowery bods of all studied cultivars. Hindy smnara cultivar have an early beginning lime and short period in the most stages ,while Dabsha cullivar have delay beginning lime ,and .Iong period in most stages and Zebda and Ewais~ cultivars came between them. These results were obtained in 'on' and 'off .year for the two studied seasons, ". | ||
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