16 new CIMMYT maize lines released

CIMMYT is pleased to announce the release of a set of 16 new CIMMYT maize lines (CMLs). These CMLs were developed at various breeding locations of the CIMMYT Global Maize Program by multi-disciplinary teams of scientists in sub-Saharan Africa, Latin America and Asia. These lines are adapted to the tropical and subtropical maize production environments targeted by CIMMYT and partner institutions.

CMLs are available free of charge to both public and private sector breeders worldwide under the standard material transfer agreement.

CIMMYT seeks to develop improved maize inbred lines with superior performance and multiple stress tolerance to improve maize productivity for the resource-constrained smallholder farmers.  To achieve this, CMLs are identified from inbred or doubled-haploid lines after intensive evaluation in hybrid combinations the respective geographies where they are developed, including various abiotic and biotic stresses, as well as suitability as either seed or pollen parent.

CML 2015 release 1

Release of a CML does not guarantee high combining ability nor high performance per se in all environments: rather, it indicates that the line is promising or useful as a hybrid component or parent for pedigree breeding for one or more target mega-environments. The descriptions of the lines include heterotic group classification, along with information on their specific combining ability with widely used CIMMYT lines.

Of note in the 16 new CMLs are a set of five doubled-haploid lines (CML566-CML570).  These are the first DH-based CMLs to be released by CIMMYT.

CML 2015 release 2

A summary of the 16 new CMLs is presented in a tabular form below. Further details, including the pedigrees of these CMLs, are available at this link.

A limited quantity of seed of the CMLs can be obtained by sending a request to the CIMMYT Germplasm Bank. Contact Denise Costich.

Presently, CML 569 line is only available to partners in East African countries that can receive seed shipments from CIMMYT–Kenya.  This is due to germplasm exchange restrictions imposed to restrict the potential movement of maize lethal necrosis (MLN) disease.  Contact: Mosisa Regasa. However, CML569 will be broadly available through the CIMMYT Germplasm Bank from July 2016.

For more details, please contact: B.M. Prasanna, Director, CGIAR Research Program MAIZE & Global Maize Program, CIMMYT.

 

Summary of release

CML CIMMYT Code Grain color Maturity Adaptation Heterotic Group Stress tolerance (in testcrosses)* Combines well with Remarks
CML562 CAL14126 White Early Tropical lowland; Asia A Drought and heat stress tolerant; resistant to TLB and common rust (PS) CML444, CML449, CML451 Suitable either as seed or pollen parent
CML563 CAL14138 Yellow Medium-Full season Tropical lowland; Asia A Drought and waterlogging stress tolerant CML433, CML451, CML565 Responds well to high- density; very good per se yield and can be used as a seed parent
CML564 CAL146 Yellow Early- Medium Tropical lowland; Asia A Drought and heat stress tolerant CML433, CML474
CML565 CAL1469 Yellow Medium-Full season Tropical lowland; Asia A Drought tolerant CML451, CML563 Very good per se performance with high inbred yield and a robust tassel; suitable either as a seed or pollen parent
CML566 CKDHL0089 White Full season Mid-altitude; sub-Saharan Africa (SSA) B Drought tolerant; resistant to MSV, GLS, and TLB; moderate tolerance to MLN CML312, CML442 Doubled haploid (DH) line with very good per se performance; can be used as either a seed or pollen parent; recovered from CML444 with improved plant stature
CML567 CKDHL0214 White Medium Mid-altitude; SSA A Drought tolerant; resistant to MSV, GLS, and TLB, but susceptible to MLN CML395, CML444 DH line with good per se performance; can be used either as a seed or pollen parent; recovered from CML539
CML568 CKDHL0228 White Medium Mid-altitude; SSA A Resistant to MSV, GLS, and TLB, but susceptible to MLN CML395, CML444 DH line with long, slender ears and a prolific habit; good per se performance; can be used as either a seed or pollen parent; recovery of CML539
CML569 CKDHL0295 White Medium Mid-altitude; SSA B Drought tolerant; resistant to MSV, GLS, and TLB, but susceptible to MLN CML312, CML442, CML539 DH line; recovery of CML395 with more compact plant type, excellent per se yield and very good stalk and root strength;  good seed parent but can also be used as a pollen parent
CML570 CKDHL0470 White Full season Mid-altitude; SSA B Drought tolerant; resistant to MSV, GLS, and TLB, and has moderate tolerance to MLN CML312, CML442, CML539 DH line; recovery of CML444 with shorter stature and lower ear position; can be used as a seed or pollen parent
CML571 CZL0718 White Early Mid-altitude; SSA B Drought and low N tolerant; resistant to PS, TLB, GLS, and MSV, but  susceptible to MLN CML540, CML545, CML546 Good per se yield and a robust tassel; can be used as either a seed or pollen parent
CML572 CZL99017 White Early-Medium Mid-altitude; SSA A Low N tolerant; resistant to PS, TLB, GLS, and MSV CML444, CML547 Very robust tassel; best suited as a pollen parent or as a component line to a single-cross seed parent
CML573 CLRCW85 White Full season Tropical lowland; Latin America (LA) A Low N tolerant; resistant to ear rot; very good tolerance to TSC CML494, CML576 Excellent pollen producer; recommended for use as a pollen parent or as a component of a single-cross seed parent
CML574 CLRCY039 Yellow Full season Tropical lowland; LA B Drought tolerant; tolerant to MLN and foliar diseases CL02450 Suitable as a pollen parent or as a component within a single-cross seed parent, but is not suitable for use as a seed parent per se
CML575 CLRCY044 Yellow Medium Tropical lowland; LA B Tolerant to low N, SCLB, TLB and TSC; resistant to ear rot CL02450 Recovery of CML451 with improved per se yield; can be used as either a pollen parent or a seed parent
CML576 CLWN247 White Medium Tropical lowland; LA B Drought and low N tolerant; excellent resistance to TSC; resistant to SCLB and TLB CML549, CML552, CML573 Good stalk and root strength; very good per se performance; performs well under high plant density; can be used as either a pollen or seed parent
CML577 CLYN214 Yellow Medium Tropical lowland; LA B Drought, low N and heat stress tolerant; resistant to SCLB, TLB and ear rot; good tolerance to TSC CLRCY015, CL02450, CLYN352 Recovery of CML451; has a slender ear; suitable as a pollen parent

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