A Comparative Analysis <strong>of</strong> Gibberellic Acid Content with Respect to Tuber Induction in Potato Plants Grown Under Differential Photoperiod and Temperature 414 The striking correlation between the increased level <strong>of</strong> GA3 during longer photoperiods with a relatively high temperature environment and the absence <strong>of</strong> tuberization strongly support the conclusion that the inhibitor <strong>of</strong> tuberization produced in the leaves under non-inducing conditions is at least in part GA3.
415 Ahmed Malkawi References [1] Amador V, Bou J, Martinez-Garcia J, Monte E, Rodriguez-Falcon M, Russo E, Prat S (2001) Regulation <strong>of</strong> potato tuberization by daylength and gibberellins. Int. J. Dev. Biol. 45 (S1): S37- S38. [2] Aung LH, De Hertogh AA, Staby G (1969) Temperature regulation <strong>of</strong> endogenous gibberellin activity and development <strong>of</strong> Tulipa gesneriana L. Plant Physiol. 44: 403-406. [3] Batutis EJ, Ewing EE (1982). Far-reversal <strong>of</strong> red light effect during long-night induction <strong>of</strong> potato (Solanum tuberosum L.) tuberization. Plant Physiol. 69: 672-674. [4] Boccalandro HE, Ploschuk EI, Yanovsky MJ, Sanchez RA, Gatz C, Casal JJ (2003) Increased phytochrome B alleviates density effects on tuber yield <strong>of</strong> field potato crops. Plant Physiol. 133: 1539-1546. [5] Carrera E, Bou J, Garcia-Martinez JL, Prat S (2000) Changes in GA 20-oxidase gene expression strongly affect stem length, tuber induction and tuber yield <strong>of</strong> potato plants. Plant J. 2: 247-256. check title? [6] Carrera E. Jackson SD, Prat S (1999) Feedback control and diurnal regulation <strong>of</strong> gibberellin 20oxidase transcript level in potato. Plant Physiol. 119: 765-773. [7] Chapman HW. Tuberization in the potato plant (1958) Physiol. Plant 11: 215-224. [8] Ewing EE, Struik PC (1992) Tuber formation in potato: Induction, initiation, and growth. Hort. Rev. 14: 89-198. [9] Fernie AR and Willmitzer L (2001) Molecular and biochemical triggers <strong>of</strong> potato tuber development. Plant Physiol. 127: 1459-1465. [10] Gregory LE (1956) Some factors for tuberization in the potato. Ann. Bot. 41: 281-288. [11] Hannapel DJ, Hao C, Rosin FM, Banerjee AK, Davies PJ (2004) Molecular controls <strong>of</strong> tuberization. Am. J. Potato Res. 81: 263-274. [12] Haverkort AJ (1990) Ecology <strong>of</strong> potato cropping systems in relation to latitude and altitude. Agr. Syst. 32: 251-272. [13] Hedden P, Phillips AL (2000) Gibberellin metabolism: new insights revealed by the genes. Trends in Plant Science 5: 523-530. [14] Hussey G, Stacey NJ (1984) Factors affecting the formation <strong>of</strong> in vitro tubers <strong>of</strong> potato (Solanum tuberosum L.) Ann. Bot. 53: 565-578. [15] Jackson SD (1999) Multiple signaling pathways control tuber induction in potato. Plant Physiol. 119: 1-8. [16] Jackson SD, Heyer A, Dietze J, Prat S (1996) Phytochrome B mediates the photoperiodic control <strong>of</strong> tuber formation in potato. Plant J. 9: 159-166. [17] Jackson SD, James PE, Carrera E, Prat S, Thomas B (2000) Regulation <strong>of</strong> transcript levels <strong>of</strong> potato gibberellin 20-oxidase gene by light and phytochrome B. Plant Physiol. 124: 423-430. [18] Jackson SD, James P, Prat S, Thomas B (1998) Phytochrome B affects the levels <strong>of</strong> a grafttransmissible signal involved in tuberization. Plant Physiol. 117: 29-32. [19] Jackson SD, Prat S (1996) Control <strong>of</strong> tuberization in potato by gibberellins and phytochrome B. Physiol. Plant. 98:407-412. [20] Kende H, Zeevart JAD (1997) The five classical plant hormones. Plant Cell 9: 1197-1210. [21] Krauss A, Marschner H (1982) Influence <strong>of</strong> nitrogen nutrition, daylength and temperature on contents <strong>of</strong> gibberellic and abscisic acid on tuberization <strong>of</strong> potato plants. Potato Res. 25: 13-21. [22] Kumar D, Wareing PF (1972) Factors controlling stolon development in the potato plant. New Phytol. 71: 639-648. [23] Kumar D, Wareing PF (1973) Studies on the tuberization in Solanum andigena. I. Evidence for the existence and movement <strong>of</strong> a specific tuberization stimulus. New Phytol. 72: 283-287. [24] Kumar D, Wareing PF (1974) Studies on the tuberization <strong>of</strong> Solanum andigena. II. Growth, hormones and tuberization. New Phytol 73: 833-840.
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