Combining Ability Analysis for Yield and Morphological Traits in Crosses Among Elite Coffee (Coffea arabica L.) Lines

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1 Combining Ability Analysis for Yield and Morphological Traits in Crosses Among Elite Coffee (Coffea arabica L.) Lines Ashenafi Ayano*, Sentayehu Alamirew, and Abush Tesfaye *Corresponding author Jima Agricultural Research Center, P.O.Box 192, Jimma, Ethiopia.

2 1. Introduction Coffee (Coffea arabica L.) is the most important plantation crop over the world More than 80 countries, including Ethiopia cultivate coffee In Ethiopia it is one of the leading export commodity It supports the livelihoods of around 25% of the population of Ethiopia Despite its great importance, the average national yield/ha is very low (about 700 kg/ha)

3 Introduction cont. Among many factors for low yield lack of pure line and hybrid varieties is the major To overcome this problem much effort has been done by the national coffee research (JARC) Over the last four decades thirty seven coffee varieties out of which: 34 selections 3 hybrids released very low number of coffee hybrids released 3

4 Introduction cont. This clearly shows that the phenomenon of heterosis and combining ability has been not exploited extensively On the other hand in some research results showed better performance in hybrids Exhaustive work in this respect is required to consolidate the previously acquired results So, the present study was conducted to investigate the combining ability of parents in crosses between lines from south western region of Ethiopia. 4

5 2. Materials and methods 2.1: Ecological Description of the Study Sites Research Center Altitude (masl.) Coordinate Temperature ( o C) Latitude Longitude Min Max Rain fall (m.m /annum) Relative Humidity (%) Jima/ Melko 'N 'E Metu '14''N '57''E Tepi '15''N '06''E

6 2.2.Description of the experimental materials Griffing (1956) method 2 model I diallel analysis was used on established coffee trials A total of 16 entries were planted in a RCBD in three replications 10 trees per plot were planted for each treatment 6

7 Table 1: Coffee lines, their origin and descriptions Line origin Altitude Description (m) P Gera 1900 Open canopy, Highly resistant to CBD P2 744 Washi, Kefa 1700 Open canopy, Highly resistant to CBD P3 F-34 Mizan-Teferi 1430 Open canopy, resistant to CBD, quality P Bishari, Illuababora 1600 Compact canopy, Highly resistant to CBD P5 206/71 Maji 1600 Compact canopy, moderate resistance to CBD, high yielder 7

8 Table2 : List of Experimental Materials Parents Hybrids produced Check X X X F-34 4 F X 206/ / X X F X 206/ X F X 206/71 15 F-34 X 206/71 16 Aba buna 8

9 Data collected: Stem characteristics: Total plant height (cm), Plant height up to first primary branch (cm), Inter-node length (cm), Stem diameter (girth) (cm) Branch characteristics: Length of the 1 st single primary branch (cm), Fruit characteristics. Fruit length (mm), Fruit width (mm), Fruit thickness (mm) Seed/bean characteristics: Bean length (mm), Bean width (mm), Bean thickness (mm), 100-bean weight at 11% moisture (gm) Yield (kg/ha): fresh cherries were harvested and weighed in grams per tree basis and converted to kg/ha. 9

10 3. RESULTS AND DISCUSSION i) Combining ability analysis Yield, fruit and bean characters Both GCA and SCA mean squares were highly significant for yield indicating both additive and non-additive gene actions are important for this trait. result indicated the importance of additive and nonadditive gene actions; non-additive being dominant. Similar finding of Bayeta (1997) and Wassu et al., (2008). result implies that exploiting hybrids by using F1 for such cases is the best approach. 10

11 Analysis of variance for across location..cont fruit and bean characters bean length, bean width, bean thickness and 100-bean weight similar to yield additive and non-additive gene actions were involved in the control of the characters For the fruit and bean traits relative contribution of GCA was predominant suggesting additive gene action contributed more for these traits. 11

12 Table 3: Mean squares due to general combining ability (GCA) and specific combining ability (SCA) for yield, fruit & bean characters in coffee diallel crosses across location Source of variation Df Yield Fruit length Fruit width Traits Fruit thickness Bean length Bean width Bean thickness 100- bean weight GCA *** *** 4.775*** 7.216*** 8.098*** 0.322*** 0.345*** *** SCA *** 0.563*** ** 0.553*** 0.064** 0.068*** 9.623*** GCA X E *** 0.344** 0.263* 0.973*** ** 7.771*** SCA X E * 0.041* 0.027* 1.724* Error Relative contribution of GCA Relative contribution of SCA * = significant at P<0.05, **= significant at P<0.01, and ***= significant at

13 Growth parameters results revealed significant variances due to GCA and SCA for all growth characters studied. The result of this study is in line with the study report of Mesfin (1982); Bayetta (1991) The relative contribution of SCA was higher than GCA for PH indicating that non-additive gene actions are predominantly important for the inheritance of this trait. HUFPB, SG, LFPB and IL exhibited higher variance due to GCA than due to SCA suggesting additive gene actions has role in controlling these traits. 13

14 Table 4: Mean squares due to general combining ability (GCA) and specific combining ability (SCA) for growth characters in coffee diallel crosses across location Source of variation Df Plant height Height up to 1 st prim branch Traits Stem Girth Length of first primary branch *** Inter node length GCA *** *** 3.31*** 2.896*** SCA *** *** 0.98*** *** 1.056*** GCA X E * ** SCA X E Error Relative contribution of GCA Relative contribution of SCA * = significant at P<0.05, **= significant at P<0.01, and ***= significant at

15 ii) General Combining ability Effects (GCAE) ii) General Combining Ability Effects Yield, fruit and bean characters GCA effects for yield (kg ha - ) parental lines P4(F34) and P5(206/71) revealed highly significant and found good general combiners. these two parents were found to be good general combiners for this important economic trait. may have good prospect for the inclusion in the breeding program for yield improvement in development of new high yielding hybrid varieties. For all fruit and bean characters P2(744) showed consistently positive and significant GCA effects indicating the good combining ability of this parent. 15

16 Table5 : Estimates of General combining ability effects (GCAE) of parental lines for yield, fruit and bean characters in coffee diallel cross across location GCA effects of each Traits parents Yield (Qt/ha) Fruit length (cm) Fruit width (cm) Fruit thickness (cm) Bean length (cm) Bean width (cm) Bean thickness (cm) 100- bean weight (gm) P1 P2 P3 P ** ** *** 0.404*** 0.516*** 0.590*** 0.125*** 0.118*** 1.355*** *** *** *** *** *** *** ** *** 1.235*** * P *** **= significant at P<0.01, and ***=significant at

17 General combining ability effects cont. P3(74148) frequently showed negative GCA effect for all growth characteristics evaluated. This indicates may be useful in the development of hybrid short and compact stature. P3(74148) appeared to be poor combiner expressing higher negative and significant GCAE. The other way this parental line may contribute in development of hybrid variety for closer spacing planting. P4(F34) found to be best combiner for SG, LFPB and IL showing significant and positive GCA effects for these traits. this parent may contribute favorable alleles for the development of vigorous hybrids. 17

18 Table 6 : Estimates of General combining ability effects (GCAE) of parental lines for growth characters in coffee diallel cross across location Parents GCA effects of each Traits Height up to 1 st Plant height (cm) prim branch (cm) Stem (cm) Girth Length of first primary branch (cm) Inter node length (cm) P *** * P ** P *** *** *** *** P *** *** *** P * = significant at P<0.05, **= significant at P<0.01, and ***= significant at

19 iii) Specific combining ability effects (SCAE) Yield, fruit and bean characters Yield: (P3xP5, P1xP5, P2xP5, P2xP4 and P3xP4) showed positive and significant SCA effects indicating that these crosses were good combinations for yield. Crosses with higher values of SCAE also showed higher value of mean yield performance, indicating good correspondence between SCAE and mean yield. 100-BW: only three crosses (P1xP5), (P3xP4) and (P2xP5) were best combinations as they showed positive and significant SCAE for this trait. 19

20 Table7: Estimates of specific combining ability effects (SCAE) of F1 Hybrids of coffee for Yield, Fruit & Bean characters across location SCA effects of each Traits Crosses Yield (Qt/ha) Fruit length (cm) Fruit width (cm) Fruit thickness (cm) Bean length (cm) Bean width (cm) Bean thickness (cm) 100- bean weight (gm) P1XP P1XP P1XP P1XP *** * ** P2XP * P2XP *** * P2XP *** ** * P3XP ** * ** P3XP *** * * P4XP * = significant at P<0.05, **= significant at P<0.01, and ***= significant at

21 5. SUMMARY AND CONCLUSIONS both additive and non-additive gene actions were involved in the inheritance of yield. The relative contribution of SCA was as high as 70% for yield indicating the predominance of non-additive gene action result implies that exploiting hybrids by using F1 for yield advantage is the best approach. GCAE of yield (q/ha) clean coffee P4(F34) and P5(206/71) revealed highly significant and found good general combiners. may have good prospect for the inclusion in the breeding program for yield improvement in development of new high yielding hybrid varieties. 21

22 SUMMARY AND CONCLUSIONS..cont P4(F34) Good combiner for growth characters. contribute favorable alleles for synthesis of vigorous hybrids. P3(74148) frequently showed negative GCA effect for all growth characteristics evaluated. may be useful in the development of hybrid short and compact stature. For FL, FW, FT, BL, BW, BT and 100-BW additive and non-additive gene actions were involved in the control of the characters studied. For the fruit and bean traits studied relative contribution of GCA was more suggesting additive gene action contributed more for these traits. 22

23 Enjoy OUR FINEST COFFEES and Cultural coffee Ceremony! I Thank You!! 23

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