New CIMMYT-derived products with MLN tolerance

NaivashaMarch 2015

Outline● CIMMYT MLN tolerant products

● MLN tolerant germplasm seed request, dispatch and source

● MLN tolerant NPT hybrids

● MLN tolerant hybrid releases

● Other related activities

● Challenges

CIMMYT MLN tolerant products

● UPDATE: Promising CIMMYT maize inbreds and pre-commercial hybrids-June 2013

● Update: CIMMYT maize inbred lines and pre- commercial hybrids with potential resistance to maize lethal necrosis (MLN)-May 2014

MLN tolerant germplasm seed request, source and dispatch in ESA: 2013/14

Country No of NARS/Centers

Seed companies

No of inbred lines

No of hybrids

Source/CIMMYT

South Africa

- 1 2 - Zimbabwe

Ethiopia 1 - 2 - ZimbabweKenya 3 4 4-18 4-17 KenyaUganda 1 2 4-18 4-17 KenyaTanzania 1 4 7-16 4-17 KenyaTotal 6 11

17 partners in 5 countries received germplasm

MLN tolerant germplasm seed request, source and dispatch in ESA: 2014/15Country No of

NARS/Centers

Seed companies

No of inbred lines

No of hybrids

Source/CIMMYT

South Africa 1 4 ZimbabweEthiopia 1 CMLs Gene bankZimbabwe 1 2 35 ZimbabweZambia 1 5 ZimbabweMalawi 1 5 ZimbabweMozambique 1 13 Zimbabwe

Kenya 5 6 11-30 1-3 KenyaUganda 2 1 30 2 KenyaTanzania 1 4 30 1-4 KenyaRwanda 1 - 20 6 KenyaTotal 13 1528 partners in 10 countries received germplasmSeed produced under supervision of KEPHIS

Some MLN tolerant hybrids were advanced to NPT in KE, TAN and UGAlso, some MLN tolerant hybrids were already in NPT in 2013

Country No of MLN tolerant hybrids in NPT in 2014

Kenya 4

Tanzania 4

Uganda 3

Hybrid NPT in Country

MLN Severity Score (1-5 Scale) at Naivasha (2014)

UH5558 Uganda 2.8CHMLND0086 Tanzania 2.8CKH12602 Kenya 3.0CKH12603 Uganda 2.8MERU HB607 Tanzania 3.0CKH12613 Tanzania 3.0H12M1 Kenya 3.2UH5354 Uganda 3.2

Commercial Check 3.7

MLN scores (on a 1-5 scale basis; 1 being highly resistant to 5 being highly susceptible)

Some CIMMYT-derived MLN tolerant hybrids under NPTs in 2013/14 and MLN score

Some NPT hybrids, Naivasha 2014

No complete resistance,but there is difference in degree of tolerance

Hybrid Yield, t/haUH5354* 9.5Company hybrid 1 9.4Company hybrid 2 9.4Company hybrid 3 9.2Company hybrid 4 9.0Company hybrid 5 8.9Company hybrid 6 8.9Company hybrid 7 8.9Company hybrid 8 8.9

* MLN tolerant hybrid

In addition to MLN tolerance, MLN tolerant hybrids must be competitive in other traits

In addition to MLN tolerance, MLN tolerant hybrids must be accepted by farmers for other traits

SATEC- Grain yields Farmers assessments

012345678

3.8

6.2 6.67.5 7.6

Mean maize grain yield t/ha

Source: THERESIA L.GREGORY –SOCIO ECONOMIST

Country Variety Status

Tanzania CKH12613 Farmers assessment/NPT

Tanzania CHMLND0086 NPT and DUS

Kenya CKH12602 NPT2

Uganda CKH12603 Farmers assessment

Kenya CKHMLN146281 NPT1

Kenya CKHMLN146030 NPT1

Kenya CKHMLN146036 NPT1

Kenya CKHMLN146106 NPT1

Kenya CKHMLN146038 NPT1

Kenya CKHMLN146092 NPT1

Kenya CKHMLN146407 NPT1

Kenya CKH13601 NPT1

Kenya CKH13606 NPT1

New hybrids entered NPT in 2015

Five hybrids recommended for release/released in KE, UG and TAN

Country Variety Status

Uganda UH5354 Released in 2013/14, already commercialized

UH5558 Recommended for release in 2014/15

Kenya H12M1 Released in 2013/14, in commercialization process

H13M2 Recommended for release in 2014/15

Tanzania HB607 Recommended for release in 2014/15

CIMMYT supported the release

● Descriptors for NPT hybrids and their parents

● Parental trials (SC and inbred parents) to generate information for seed production

● Increase NPT, DUS, breeder/initial and demo seeds and supply to partners

● Financial support through small grant

Seed companies use the information in their seed production activities

Challenges

● Not all the parents of MLN tolerant hybrids are tolerant/resistant; need MLN free area for seed production

● Need long term breeding to come-up with all parents resistant to MLN; already on-going

Good to combine tolerant variety + agronomy

Thanks!!