Development and characteristics of maize (Zea mays L.) inbred line 'Mi44'.

摘要

A new maize inbred line, Mi44, was developed by the National Agricultural Research Center for Kyushu Okinawa Region (formerly Kyushu National Agricultural Research Station) and registered as Nourin Kou Oya No. 52 by the Ministry of Agriculture, Forestry and Fisheries of Japan in October 2001. Mi44 was selected from sib-cross progeny of P3358, originating from a dent group in the United States. It was selected for resistance to lodging, southern leaf blight (Bipolaris maydis [Cochliobolus heterostrophus]) and sheath blight (Rhizoctonia solani), and for high combining ability. Selection and selfing were conducted until the S6 generation. Mi44 belongs to the medium-maturing group in Kyushu. It shows high levels of lodging resistance and strong resistance to southern leaf blight and sheath blight, and exhibits excellent combining ability with inbreds derived from a Japanese flint group and inbreds derived from American dent groups. Mi44 is the seed parent of a single-cross hybrid cultivar, Yumetsuyoshi, which shows high yield and strong lodging resistance. The stalk length is moderately long and the ear height is intermediate. The plant type is upright. The seed yield ability is intermediate. The ear has an average of 12.1 rows of round, orange kernels with a 100-kernel weight of 30.8 g.