%0 Journal Article
%T Effects of Reciprocal Recurrent Selection on Grain Yield in Two Tropical-Temperate Maize Synthetic Populations Tuxpeño-Reid and Suwan-Lancaster
%A Zehui Chen
%A Yunfang Zhu
%A Angui Wang
%A Xiangyang Guo
%A Xun Wu
%A Pengfei Liu
%J American Journal of Plant Sciences
%P 298-308
%@ 2158-2750
%D 2019
%I Scientific Research Publishing
%R 10.4236/ajps.2019.102023
%X <p style=\"text-align:justify;\">
	<span style=\"font-family:;\" \"=\"\"><span style=\"font-family:Verdana;\">Reid, Lancaster, Tuxpeno and Suwan are the most
common maize (</span><i><span style=\"font-family:Verdana;\">Zea mays L</span></i><span style=\"font-family:Verdana;\">.) germplasms. Reid ¡Á Lancaster and Suwan ¡Á
Tuxpeno are very important het</span><span style=\"font-family:Verdana;\">erotic
patterns in temperate areas and tropical areas, respectively. Broadening the
genetic basis of maize has usually been conducted in inter-populatio</span><span style=\"font-family:Verdana;\">ns
formed by crossing temperate and tropical germplasms. Reciprocal recurrent selection
(RRS) is a breeding procedure to improve the inter-populational cross of two
base populations. The objective of this study was to evaluate the direct and
indirect effects of reciprocal recurrent selection on grain yield in the TR
(Tuxpeno-Reid) and SL (Suwan-Lancaster) maize populations. The populations and
the inter-populational crosses of each selection cycle, as well as two
commercial hybrids, were evaluated in four environments. The effect of mean
grain yield on TR ¡Á SL inter-population crosses was 4.63% (or 0.365 Mg¡¤ha</span><sup><span style=\"font-family:Verdana;\">-1</span></sup><span style=\"font-family:Verdana;\">)
cycle</span><sup><span style=\"font-family:Verdana;\">-1</span></sup><span style=\"font-family:Verdana;\">. The grain yield of SL increased by 2.78% (or 0.20 Mg¡¤ha</span><sup><span style=\"font-family:Verdana;\">-1</span></sup><span style=\"font-family:Verdana;\">)
cycle</span><sup><span style=\"font-family:Verdana;\">-1</span></sup><span style=\"font-family:Verdana;\">, but the grain yield of TR essentially did not change. Most
changes in other agronomic traits occurred in the desired direction. After 3
selection cycles, the ear tip-barrenness length decreased in TR ¡Á SL, TR and SL
by 39.70%, 37.50% and 24.57%, respectively, which indicates that the increase
in grain yield may be largely due to a decreasing ear tip-barrenness length.
The mid-parent heterosis of grain yield of the inter-populational cross
increased from 15.49% to 25.96% from C0 to C3. The mean grain yields of TRC3 ¡Á
SLC3 were 100.01% and 103.88% of the mean grain yields of the commercial
single-crosses GD8 and QD16, respectively. The results suggest that Tuxpeno-Reid
¡Á Suwan-Lancaster may be possible new heterotic patterns in the southern region
of China.</span></span> 
</p>
%K Reciprocal Recurrent Selection
%K Maize Germplasm
%K Population Improvement
%K Tropical
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=90776