TY - JOUR AU - Gutam, Sridhar AU - Nath, Virendra AU - Srivastava, GC PY - 2008/11/11 Y2 - 2024/03/28 TI - Endogenous hormonal content during grain development in hexaploid and tetraploid wheat JF - Bangladesh Journal of Agricultural Research JA - Bangladesh J. Agric. Res VL - 33 IS - 3 SE - Articles DO - 10.3329/bjar.v33i3.1608 UR - https://www.banglajol.info/index.php/BJAR/article/view/1608 SP - 493-502 AB - <!--[if gte mso 9]><xml> Normal 0 false false false MicrosoftInternetExplorer4 </xml><![endif]--><!--[if gte mso 9]><xml> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <style>st1\:*{behavior:url(#ieooui) }</style> <![endif]--> <!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}</style> <![endif]--> <p>A pot experiment was conducted in the <em>rabi </em>(post rainy) seasons of 2001 and 2002 to study the genotypic differences in grain growth rate and endogenous hormonal content in the developing grains of <em>hexaploid </em>and <em>tetraploid </em>wheat. The endogenous hormonal contents of grains in both the ploidy levels had changed in sequence. At 5 days after anthesis (DAA), gibberellic acid (GA<sub>3</sub>); at 15 DAA (rapid growth phase), indole-acetic acid (IAA); at 25 DAA (dough stage), abscisic acid (ABA) were maximum. At 35 DAA, all the endogenous hormonal level decreased and among the hormones, ABA was highest followed by IAA and GA<sub>3</sub>. <em>Hexaploids </em>recorded higher concentrations of endogenous hormones (13.38% IAA, 17.89% GA<sub>3</sub>, and 14.7% ABA) on fresh weight basis and resulted in higher seed weight (56.99 mg/grain) and grain growth rate (0.009 g/g/day) compared to <em>tetraploids </em>(49.08 mg/grain; 0.008 g/g/day) on dry weight basis by better mobilization of photosynthates during grain filling.</p> <p><strong>Key Words:</strong> Grain growth rate, hormones, indole-acetic acid, gibberellic acid, abscisic acid.<em> </em></p> <p>doi:10.3329/bjar.v33i3.1608</p> <p>Bangladesh J. Agril. Res. 33(3) : 493-502, September 2008</p> ER -