One waxy, one popcorn and three semi-dent germplasms were developed. These have been tested and used in hybrid production as new germplasm resources. Sixteen hybrids were developed. We bred these new germplasms by using inbreeding and dwarf selection from an improvement population which was bred by recurrent selection. Though each possessed its own characteristics and specific properties, all showed good disease resistance and high combining ability.

The results for disease resistance in all five new germplasms are shown in Table 1. Yinuo 303, JB, Zi24, MoA and Yi 508 all had good resistance to Helminthosporium turcicum, H. maydis, Pythium aphanidermatum and Fusarium graminearum, Ustilago reiliana and maize dwarf mosaic virus (MDMV).

The five new germplasms have different responses to different types of CMS (Table 2).

Table 1. The disease resistance of five new germplasms. HR = high resistance, MR = medium resistance, and R = resistance.
 

Germplasm	H. turcicum	H. maydis	P. apahan. & F. gramin.	U. reiliana	MDMV
Yinuo 303	HR	HR	R	R	MR
JB	HR	MR	R	R	MR
Zi24	HR	HR	R	R	MR
MoA	HR	HR	R	R	MR
Yi508	HR	HR	R	R	MR

Table 2. Fertile reaction of five germplasms to different CMS types. + = full restoration; - = maintenance.
 

	Cytoplasm
Germplasm	T	S	C
Yinuo 303 waxy	-	-	-
JB popcorn	-	-	+
Zi24 semident	-	+	-
MoA semident	-	+	-
Yi508 semident	-	-	+

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