Maize Genetics Cooperation Newsletter vol 84 2010

Please Note: Notes submitted to the Maize Genetics Cooperation Newsletter may be cited only with consent of authors.

 

MNLCORCUERA20101.DOC

 

CASTELAR, ARGENTINA

 

INSTITUTO DE GENƒTICA DR. E. A. FAVRET, CICVyA INTA CASTELAR  AND COMISIîN DE INVESTIGACIONES CIENTêFICAS PCIA. BUENOS AIRES (C.I.C.)

 

 

Yield evaluation trial of specialty maize inbreds

 

Corcuera V.R.1, Kandus M.2, Salerno J.C.2, Moreno-Ferrero V.3

 

1. Com. Inv. Cient’f. Pcia. Bs. As.   2. Inst. GenŽtica E.A. Favret-INTA  3. ETSIA-Universidad PolitŽcnica de Valencia (Spain)

 

 

A completely randomized block design yield trial was sown by the beginning of November 2009 in a surface gently loaned by the School of Agriculture-Universidad Nacional de Lomas de Zamora within their experimental campus placed at the location of Virrey del Pino (Province of Buenos Aires, Argentina).  The growing season 2008/09 was characterized by high temperatures and droughtness. Fourty-four inbreds, including the six termed CIG8, CIG12, CIG29, CIG30, CIG18 and CIG39 that are under official channels to be inscribed in the National Register of Cultivar Property (R.P.N.C.) were evaluated by their grain yield according to the following methodology. The ears of each plot were hand harvested, threshed and the grains weighted. Kernel«s humidity degree was determined using a portable humedimeter Protimeter Grainmaster 900 and kernels weight was corrected to commercial starndard humidity (15%). The average yield per plant (AYP) was obtained dividing the kernels weight per plot by the number of plants at harvest and was expressed in grams. Potential yield (PY) expressed as kilograms of grain per hectare, was estimated multiplying the AYP by 71,500 (plants density at harvest). 

 

According to the type of grain the inbreds tested can be grouped as: I. Modified starch, high amylopectin content maize (waxy), II. High-quality protein maize (HQP), III. High-quality protein and modified starch maizes (double mutants or DR), IV. Soft and starchy endosperm (SE), V. Hard and vitreous endosperm maize (VE).

 

The data for AYP and PY calculated for each inbred tested are included in Table 1. The general media of the trial was 52.3 ± 10.6 grams of kernels/plant (range= 31.4 to 72.9 grams.) and  3739.9 ± 759.6 kilograms of kernels/hectare (range= 2245.1 to 5212.4 Kg. kernels/hectare) of which the minimun values belong to the waxy inbred  CIG8 and the highest to the double mutant wxo2 CIG29.

 

The AYP, average PY and yield range for each group of inbreds are as follows=

 

 

waxy            50.3 ± 10.1 gr. kernel/plant and 3597,0 ± 724,1 Kg.  kernel/ha

                  (31.4 to 64.5 gr.  kernel/plant to 2245,1 to 4611.8 Kg.  kernel/ha)

 

HQP             45.4 ± 10.3 gr. kernel/plant and 3244,2 ± 740,4 Kg.  kernel/ha 

                  (32.5 to 69.4 gr. kernel/plant and 2323,8 to 4962,1 Kg. kernel/ha)

 

DR               55.7 ± 8.5 gr. kernel/plant and 3983,6 ± 607,0 Kg. kernel/ha

                  (44.1 to 72.9 gr. kernel/plant and 3153,2 to 5212,4 Kg. kernel/ha)

 

SE               57.6 ± 6.1 gr. kernel/plant and  4118,4 ± 439,9 Kg. kernel/ha

                (50.1 a 64.1 gr. kernel/plant and 3582,2 to 4583,2 Kg. kernel/ha)

 

VE             69.0 ± 3.8 gr. kernel/plant and 4933,5 ± 273,0 Kg. kernel/ha

                (66.3 to 71.7 gr. kernel/plant and 4740,5 to 5126,6 Kg. kernel/ha)

 

 

The groups of inbreds with hard and starch endosperm (VE and SE) showed the shortest dispersion of values for AYP (CV%= 5.5 and 10.7 respectively) whilst the HQP inbreds shown the greatest divergence for this descriptor (CV%= 22.7). The above results point out that in average, the quality protein materials are the less yielding ones, all the opposite than hard endosperm inbreds whilst similar results were obtained for the double mutants and starchy endosperm inbreds tested.

 

When the averages were compared applying Student«s t test it was found that there are highly significant differences amongst the waxy, HQP and DR inbreds in relation to the VE group as well as significant differences were detected between HQP and SE  or HQP and DR inbreds (see Table 2).

 

It must be said that the yield of the inbreds termed CIG1 to CIG32 decreased approximately a 15% in relation to the values calculated in a MET conducted at the location of Llavallol (Province of Buenos Aires) during 2002/03 to 2004/05.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TABLE 1= Yield average for each inbred evaluated during 2008/09 growing season

 

 

INBRED

TYPE

AYP

PY

INBRED

TYPE

AYP

PY

CIG1

Waxy

55,1

3939,7

CIG56

H

32,5

2323,8

CIG4

Waxy

60,7

4340,1

CIG57

H

35,8

2559,7

CIG6

Waxy

51,2

3660,8

CIG27

DR

67,0

4790,5

CIG7

Waxy

41,4

2960,1

CIG29

DR

72,9

5212,4

CIG8

Waxy

31,4

2245,1

CIG30

DR

61,5

4397,3

CIG9

Waxy

53,7

3839,6

CIG36

DR

60,4

4318,6

CIG10

Waxy

64,5

4611,8

CIG38

DR

55,8

3989,7

CIG11

Waxy

44,0

3146,0

CIG39

DR

50,1

3582,2

CIG12

Waxy

55,3

3954,0

CIG40

DR

60,3

4311,5

CIG13

Waxy

64,5

4611,7

CIG42

DR

47,8

3417,7

CIG15

Waxy

37,7

2695,6

CIG43

DR

45,9

3281,9

CIG41

Waxy

48,9

3496,4

CIG44

DR

53,7

3839,6

CIG49

Waxy

45,6

3260,4

CIG47

DR

44,1

3153,2

CIG16

HQP

43,2

3088,8

CIG50

DR

63,4

4533,1

CIG17

HQP

55,0

3932,5

CIG52

DR

45,5

3253,3

CIG18

HQP

49,6

3546,4

CIG55

DR

51,6

3689,4

CIG20

HQP

69,4

4962,1

CIG48

SE

60,8

4347,2

CIG23

HQP

49,3

3525,0

CIG51

SE

64,1

4583,2

CIG34

HQP

41,5

2967,3

CIG53

SE

55,4

3961,1

CIG35

HQP

37,3

2667,0

CIG54

SE

50,1

3582,2

CIG45

HQP

40,2

2874,3

CIG32

VE

71,7

5126,6

CIG46

HQP

45,3

3239,0

CIG37

VE

66,3

4740,5

 

 

 

 

TABLE 2= Comparison of groups AYP by means of Student«s t test

 

 

 

HQP

DR

SE

VE

waxy

1.17 ns

1.47 ns

1.75 ns

4.79 **

HQP

 

2.64 *

2.79 *

5.73 **

DR

 

 

0.49 ns

3.71 **

SE

 

 

 

2.78 ns

 

ns= non-significant differences; *= significant at p: 0.05 level; **= significant at p: 0.01 level