%0 Journal Article
%T Bioassay of Winter Wheat for Gibberellic Acid Sensitivity
%A Alexander D. Pavlista
%A Dipak K. Santra
%A David D. Baltensperger
%J American Journal of Plant Sciences
%P 2015-2022
%@ 2158-2750
%D 2013
%I Scientific Research Publishing
%R 10.4236/ajps.2013.410252
%X <p class=\"MsoNormal\">
	<span lang=\"EN-US\"><span style=\"font-family:Verdana;\">Increasing
winter wheat seedling growth would make it a better winter cover crop.
Gibberellic acid (GA</span><sub><span style=\"font-family:Verdana;\">3</span></sub><span style=\"font-family:Verdana;\">) seed treat</span></span><span lang=\"EN-US\" style=\"font-family:Verdana;\">ment may accomplish this
by stimulating stem growth. A bioassay, mimicking field conditions, could
determine the relative sensitivity of conventional and semi-dwarf cultivars. In
growth chambers set for cool (10¡æ/4¡æ) and warm (21¡æ/4¡æ) conditions, wheat
seeds </span><span lang=\"EN-US\" style=\"font-family:Verdana;\">were </span><span lang=\"EN-US\"><span style=\"font-family:Verdana;\">treated with 0 and 125 to 16,000 ppm GA</span><sub><span style=\"font-family:Verdana;\">3</span></sub><span style=\"font-family:Verdana;\">. The
cultivars Goodstreak (tall or conventional) and Wesley (semi-dwarf) were
compared as standards. Emergence and plant height were measured. </span></span><span lang=\"EN-US\" style=\"font-family:Verdana;\">¡°</span><span lang=\"EN-US\" style=\"font-family:Verdana;\">Goodstreak</span><span lang=\"EN-US\" style=\"font-family:Verdana;\">¡±</span><span lang=\"EN-US\"><span style=\"font-family:Verdana;\"> showed a significant
growth promotion at 500 ppm GA</span><sub><span style=\"font-family:Verdana;\">3</span></sub><span style=\"font-family:Verdana;\"> when seeds were dipped and 2000 ppm
when GA</span><sub><span style=\"font-family:Verdana;\">3</span></sub><span style=\"font-family:Verdana;\"> was applied in-furrow under both temperature regimes. </span></span><span lang=\"EN-US\" style=\"font-family:Verdana;\">¡°</span><span lang=\"EN-US\" style=\"font-family:Verdana;\">Wesley</span><span lang=\"EN-US\" style=\"font-family:Verdana;\">¡±</span><span lang=\"EN-US\"><span style=\"font-family:Verdana;\"> in general required the
same or a higher dose of GA</span><sub><span style=\"font-family:Verdana;\">3</span></sub><span style=\"font-family:Verdana;\">. Separately, the seed</span></span><span lang=\"EN-US\" style=\"font-family:Verdana;\">s</span><span lang=\"EN-US\"><span style=\"font-family:Verdana;\"> of nine other cultivars
were treated with GA</span><sub><span style=\"font-family:Verdana;\">3</span></sub><span style=\"font-family:Verdana;\"> as the standards. Based on maximum height promotion,
the most sensitive cultivars under cool conditions were Goodstreak, Harry,
Millenium, and Wahoo; under warm conditions, the most sensitive cultivars were
Alliance, Goodstreak, Jagalene, and
%K Plant Growth Regulator
%K Gibberellin
%K Planting Aid
%K Cover Crop
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=38109