. Canadian Journal of Plant Pathology, 26: 325-334. Fernandez, M.R. and Holzgang, G. 2009. Fungal populations in subcrown internodes and crowns of oat crops in Saskatchewan. Canadian Journal of Plant Science, 89: 549-557. Fernandez, M.R., Fox, S.L., Hucl, P., Singh, A.K., Stevenson, F.C. 2014. Root rot severity and fungal populations in spring common, durum and spelt wheat, and Kamut grown under organic management in western Canada. Canadian Journal of Plant Science, 94:937-946. Kokko, E.G., Conner, R.L., Kozub, G.C. and Lee, B. 1995. Effects of
M.I.E. Arabi, E. Al-Shehadah and M. Jawhar
M. Abo-Youssef, A. El Sabagh, G. Abo-Gendy and A. Mohamed
.S. (2002). Advances in hybrid rice research and development in the tropics. Proceedings of the 4th international Symposium on Hybrid Rice. Hanoi, Vietnam, 14-17 May, 2002, 7-20. Yin, C., Gan, L., Denny, N.G., Zhou, X. & Xia, K. (2007). Decreases paniclederived indole-3-acetic acid reduces gibberellin A1 level in the uppermost internode, causing panicle enclosure in male sterile rice Zhenshan 97A. J. Exp. Bot., 58(10): 2441-2449. Yuan, G.F. (2011). Development of hybrid rice and its prospect. China Agric. Sci. Bull., 27(15): 6-11 (in
Małgorzata Maślanka and Renata Magdziarz
This study was conducted to investigate the effect of various horticultural substrates (compost, peat-coconut, peat TS1, flower soil, lowmoor peat) and a foliar spray of chlormequat (at a concentration of 1380 mg dm-3) on the growth and flowering of the marigold cultivars belonging to two species: Tagetes erecta - ʻMarvel Mixtureʼ and ʻTaishan Orangeʼ, and Tagetes patula - ʻDurango Redʼ and ʻBonanza Flameʼ. The obtained results show that the plants grown in peat TS1 and peat-coconut were taller, had longer internodes and leaves, and thicker stems than the plants grown in the other substrates. Chlormequat significantly reduced the height of ʻMarvel Mixtureʼ (in peat TS1), ʻTaishan Orangeʼ (in lowmoor peat) and ‘Bonanza Flameʼ (in peat-coconut). The use of chlormequat also accelerated the development of flower heads in ʻTaishan Orangeʼ (in lowmoor peat).
The present study has described a simple protocol for efficient plant regeneration of Asparagus densiflorus ‘Sprengeri’ and ‘Myriocladus’ using single-node spear explants, and indirect organogenesis via callogenesis induced on internode explants. The results showed that the genotypes ‘Sprengeri’ and ‘Myriocladus’ regenerated to complete plants via nodal cultures and callus tissue, but the plant regeneration response was higher in secondary explants on MS medium with NAA + kinetin (1+1 mg dm-3) after transfer onto a multiplication medium with IAA+BAP (1+4 mg dm-3), and then onto a rooting medium supplemented with IBA (10 mg dm-3) or NAA + kinetin (1+1 mg dm-3). Primary explants of both cultivars showed high regenerative potential (via the callus stage) on MS medium with IAA+BAP. The cultivar Sprengeri also regenerated via somatic embryogenesis. Both kinds of ‘Meyeri’ explants have a morphogenetic potential for the formation of shoots, which, however, were not capable of rooting. This confirms that the explant, genotype and culture medium are determining factors in the in vitro plant regeneration system.
Tadeusz Jacyna, Wiesław Wójcik and Tomasz Lipa
Effects of different pH sprays on the efficiency of prohexadione-Ca in sweet cherry trees
In 2003 and 2004, young ‘Kordia’ sweet cherry trees were sprayed with prohexadione-Ca (Pro-Ca) to control tree growth and stimulate flower bud setting. A rate of 200 mg Pro-Ca l-1 × 2 dissolved in various pH-buffered (6.0-4.5) aqueous solutions was used. Regardless of the acidity of the spray solution applied, the trees treated with Pro-Ca were characterised by reduced shoot and internode length, greater number of shoots (2003) and increased total shoot extension (2004) relative to the control. In both years, Pro-Ca applied in a pH-4.5 buffer solution contributed to an increase of flower bud clusters on current-season shoots. However, there were no significant differences among Pro-Ca/pH treatments either in the vegetative or generative characteristics studied. Two years after Pro-Ca application, no residual effects were found in the studied tree characteristics.
Jaime A. Teixeira da Silva and Judit Dobránszki
thin cell layer culture. Acta Sci. Biol. Sci. 37(2): 143-149. H edayat H., A bdi G h ., K hosh -K hui M., 2009. Regeneration via direct organogenesis from leaf and petiole segments of pyrethrum [ Tanacetum cinerariifolium (Trevir.) Schultz-Bip.]. American-Eurasian J. Agric. Environ. Sci. 6: 81-87. L iu Q., S alih S., H ammerschlag F., 1998. Etiolation of ‘Royal Gala’ apple ( Malus x domestica Borkh.) shoots promotes high-frequency shoot organogenesis and enhanced β–glucuronidase expression from stem internodes. Plant Cell Rep. 18: 32-36. L
Karl-Johan I. Bergstrand
-312. Caron J., Rivière L.-M., Charpentier S., Renault P., Michel J.-C., 2002. Using TDR to estimate hydraulic conductivity and air entry in growing media and sand. Soil Sci. Soc. Am. J. 66: 373-383. Carvalho S., Heuvelink E., Cascais R., Van Kooten O., 2002. Effect of day and night temperature on internode and stem length in chrysanthemum: is everything explained by DIF? Ann. Bot. 90: 111-118. Casal J., Smith H., 1989. The function, action and adaptive significance of phytochrome in light‐grown plants. Plant Cell Environ.12: 855