Inheritance of grain shedding and abscission layers in the cross combination between rice varieties

2010 ◽  
Vol 13 (2) ◽  
pp. 83-89 ◽  
Author(s):  
Dam Xuan Van ◽  
Il-Doo Jin
Keyword(s):  
Cross Combination ◽  
Rice Varieties ◽  
The Cross ◽  
Grain Shedding ◽  
Abscission Layers

ASSESSING THE COMBINING ABILITY OF RICE GENOTYPES IN F1 GENERATION USING COMPLETE DIALLEL CROSS

2021 ◽  
Vol 36 (2) ◽  
pp. 135-140
Author(s):  
I. A. Odhano ◽  
H. B. Bozdar ◽  
M. A. Sial
Keyword(s):  
Grain Yield ◽  
Short Stature ◽  
Combining Ability ◽  
Panicle Length ◽  
Negative Effects ◽  
Cross Combination ◽  
Rice Varieties ◽  
Early Maturity ◽  
Positive Effects ◽  
Days To Heading

A complete diallel analysis was carried out to determine combining ability of Shandar, NIA-Mehran, NIA-19/A, KS-282 and Shua-92 rice varieties in F1 during 2017. The objective of the study was to identify potential recombinants for future rice breeding program. The research was conducted at Nuclear Institute of Agriculture, Tandojam. Genotypic mean squares were significant (P ?0.01) for all of the traits i.e.; days to heading, days to maturity, plant height, number of tillers plant-1, panicle length, grains panicle-1 and grain yield plant-1 indicating genetic variation. Importance of both additive and non-additive gene action was found with preponderance of additive genetic effects in expression of traits studied. Showing negative GCA effects, NIA-Mehran, NIA-19/A and Shua-92 proved better parent varieties for developing early maturity. While, NIA-Mehran, KS-282 and Shua-92 for developing short stature genotypes. While, Shandar remained the best combiner for yield and yield associated traits with higher positive GCA effects. Cross combination of Shandar × KS-282 was the best with higher negative effects for days to heading and maturity and higher positive effects for grain yield plant-1. NIA-Mehran × Shua-92 gave the highest negative SCA effects indicating best combination for short stature. In case of number of tillers plant-1 and grains panicle-1, the cross NIA-19/A × KS-282 was the better combination with the highest positive SCA effects. Shandar × NIA-Mehran manifested the highest value for panicle length. Findings of reciprocal SCA  revealed that the reciprocal cross combination of Shua-92 × Shandar was fruitful illustrating negative effects for days to heading and maturity. While, KS-282 × NIA-Mehran was the best reciprocal combination for yield and yield associated traits. It is concluded that rice varieties Shandar and NIA-Mehran could be used to improve yield contributing traits in rice, while, NIA-Mehran and KS-282 may be used to improve early maturity and short stature in rice crop.

Chemically induced dynamic nuclear and electron polarization. Part IX. The photolysis of tetrafluoro-p-benzoquinone in dioxane

1976 ◽  
Vol 54 (6) ◽  
pp. 979-983 ◽  
Author(s):  
Harish M. Vyas ◽  
Jeffrey K. S. Wan
Keyword(s):  
Radical Pair ◽  
Combination Product ◽  
Cross Combination ◽  
Excited Triplet ◽  
Primary Radical ◽  
Electron Polarization ◽  
Chemically Induced ◽  
Field Dependent ◽  
The Cross ◽  
Primary Radical Pair

The photoreduction of p-fluoranil in dioxane was studied by combined CIDNP and CIDEP techniques. It was established that the photoreactive species is the excited triplet of the quinone and the phototriplet mechanism is mainly responsible for the CIDEP observation. The CIDNP observations revealed the cage recombination of the primary radical-pair resulting in the formation of the cross-combination product from the semiquinone and the dioxane radicals. The cage recombination cannot be monitored by the conventional kinetic esr technique. The field dependent CIDNP intensity of the p-fluoranil in the photoreduction by fluorohydroquinone was also studied and a calculation based on Lawler's scheme showed that the results can be adequately explained by the radical-pair theory including both the scavenged and cage combination processes.

Pressure dependence of the cross-combination ratio for CF3 and CH3 radicals

1971 ◽  
Vol 75 (14) ◽  
pp. 2225-2226 ◽  
Author(s):  
G. O. Pritchard ◽  
P. C. Kobrinsky ◽  
S. Toby
Keyword(s):  
Pressure Dependence ◽  
Cross Combination ◽  
The Cross

scholarly journals COMBINING ABILITY FOR FLOWERING AND YIELD TRAITS OF JATROPHA (Jatropha curcas L)

2017 ◽  
Vol 29 (1) ◽  
pp. 1-10
Author(s):  
A. K. M. Aminul Islam ◽  
N. Anuar ◽  
Z. Yaakob ◽  
M. Osman
Keyword(s):  
Seed Yield ◽  
Combining Ability ◽  
Yield Traits ◽  
Cross Combination ◽  
Components Of Variance ◽  
Genetic Components ◽  
Combining Ability Analysis ◽  
The Cross ◽  
Half Diallel ◽  
Positive Effect

An experiment was conducted with 6 × 6 half diallel population to determine the combining ability for yield characters in Jatropha. Combining ability analysis revealed that both general and specific combining ability variances were significant for all the characters studied. GCA was observed to be higher in magnitude for majority of the characters except number of inflorescence per plant indicating that these characters were predominantly under additive genetic control. The non additive components of variance were also involved in the inheritance of number of inflorescence per plant. The parent P1 was the best general combiner for most of the traits including earliness and seed yield per plant and P5 was the poor general combiner for all the traits except hundred seed weight. Higher negative SCA effect was found in the cross combination P1×P3 for earliness and positive effect for seed yield per plant. Finally, it can be concluded that both additive and dominant genetic components are important for earliness and seed yield in Jatropha. The cross combination P1×P2, P1×P3, P2×P5 and P4×P6 is found promising for earliness and seed yield per plant. These combinations could be selected for the development of hybrid varieties in Jatropha.

scholarly journals In vitro embryo rescue for the production of hypotetraploids after cross between hypotetraploid and tetraploid grape cultivars

2020 ◽  
Vol 48 (1) ◽  
pp. 503-508
Author(s):  
Si-Hong KIM ◽  
Joon-Ho KWON ◽  
Young-Sik PARK ◽  
Jae-Yun HEO
Keyword(s):  
Embryo Rescue ◽  
Low Frequency ◽  
Cross Combination ◽  
Cross Pollination ◽  
Embryo Formation ◽  
Seedless Grape ◽  
Basal Media ◽  
The Cross ◽  
Grape Cultivars

Consumer demand for seedless grape with high quality and large berry has been increasing. Breeding of hypotetraploid grape was suggested as one of promising methods to satisfy it, but low frequency of hypotetraploid occurrence and low seed germination by abortive embryo were indicated as the major problem to hamper the development of hypotetraploid grape. Hence, this study was carried out to evaluate the basic efficiency of in ovulo embryo culture after the cross between hypotetraploid (‘Hanareum’) and tetraploid (‘Honey Black’ and ‘Kyoho’) grape cultivars on the establishment of hypotetraploid grapes. Embryos and plantlets were hardly obtained in ovules cultured at six after the cross pollination (WAP), but ovules inoculated at 10 WAP produced more embryos as well as plantlets regardless of cross combination. Furthermore, we found that embryo formation was not affected by the basal media in ovules cultured at six WAP, but utilization of specific medium can be more beneficial for embryo formation when ovules were cultured at 10 WAP. A total of 17 plants were obtained from ovules cultured at 10 WAP, and above 50% of plants were identified as hypotetraploid grapes. These results indicate that in vitro embryo rescue after cross pollination between hypotetraploid and tetraploid grape can enhance the efficiency for the breeding of hypotetraploid grapes.

scholarly journals Study of heterosis in heat tolerant tomato (Solanum lycopersicum) during summer

2013 ◽  
Vol 38 (3) ◽  
pp. 531-544 ◽  
Author(s):  
MM Alam Patwary ◽  
M Mizanur Rahman ◽  
Shahabuddin Ahmad ◽  
MA Khaleque Miah ◽  
Haimonti Barua
Keyword(s):  
Shelf Life ◽  
Fruit Set ◽  
Agricultural Research ◽  
Research Field ◽  
Agricultural Research Institute ◽  
Cross Combination ◽  
Flower Production ◽  
Heat Tolerant ◽  
The Cross ◽  
Positive Heterosis

An experiment was conducted at the Vegetable Research Field of Olericulture Division, Horticulture Research Cente, Bangladesh Agricultural Research Institute (BARI), Gazipur during May to October 2008 to study heterosis using eight parents viz., P1, P2, P3, P4, P5, P6, P7, and P8. Most of the combinations showed better parent heterosis for earliness. Eight crosses showed positive heterosis for flower production. The highest heterotic effect for fruit set (%) was found in the cross P6 × P7 (62.59%) followed by that in P7 × P8 (60.49%) and P1 × P7 (40.00%). For fruits per plant, 8 crosses provided more than 15 % heterosis over better parent. Considering fruit yield per plant, higher degree of heterosis was manifested by 24 hybrids over better parent ranging from 13.58 to 282.63 %. Cross combination P4 x P7 showed the maximum significant positive heterosis followed by P6 x P7 (187.84 %), P4 x P8 (166.97 %), P3 x P7 (146.08 %), P3 xP6 (103.92 %), and P1 X P7 (100.45 %) and the minimum in P4 x P6 (13.58 %). For viable pollens, P3 x P5 (20.56 %) exhibited the highest positive heterosis. In case of shelf life, the highest heterosis was observed by the cross P3 x P6 (22.78 %) followed by that in P4 x P6 (22.29 %) and P2 x P6 (14.40 %). For fruit flesh thickness, 12 hybrids exhibited more than 10 % heterosis. Pollen tubes as well as viable pollens showed positive correlation with fruit set. DOI: http://dx.doi.org/10.3329/bjar.v38i3.16980 Bangladesh J. Agril. Res. 38(3): 531-544, September 2013

scholarly journals Water relations composition among Egyptian cotton genotypes under water deficit

2021 ◽  
pp. 5-15
Author(s):  
Maamoun A. Abdel-Moneam ◽  
Waleed A. E. Abido ◽  
Mohammed H. Ghoneima ◽  
Ágnes Hadházy ◽  
László Zsombik ◽  
...  
Keyword(s):  
Water Deficit ◽  
Water Shortage ◽  
Stress Sensitivity ◽  
Hybrid Breeding ◽  
Yield Reduction ◽  
Tolerance Index ◽  
Cross Combination ◽  
Cotton Genotypes ◽  
The Cross ◽  
Egyptian Cotton

Background: water shortage is one of the major factor effects on growth characters and yield of most crops. Objective: this study was conducted to get to know the reactions of some Egyptian cotton genotypes to water deficit. Methods: The genetic materials used in this study included thirteen cotton genotypes belonging to Gossypium barbadense L., from the Cotton Research Institute (CRI), which was devoted to establishing the experimental materials for this investigation. Results: the ratio of GCA/SCA was less than unity for all studied indices, indicating predominance of non-additive gene action (dominance and epistasis), which is an important in exploitation of heterosis through hybrid breeding. Results: The data showed significant reduction in water relationship characters for all parental genotypes under stress conditions. The Egyptian variety Giza 68 gave high values for most water relationship characters. Data revealed that the greater the value of tolerance index is, the larger the yield reduction is under water deficit conditions and the higher the stress sensitivity is becoming. The parental genotypes Giza 96 showed the highest reduction in yield under water deficit conditions. At the same time, the cross combination Minufy x Australy showed higher values of yield reduction followed by the combinations Giza 67 x Australy. Of the male parents, the Russian genotype 10229 recorded the best GCA values for most water relationship characters. At the same time, the female parents, the old Egyptian genotype Giza 67 recorded the best values and exhibited good general combined for most water relationship characters. The cross combinations Giza 86 x Pima S6, Giza 77 x Pima S6, Giza 94 x Dandra and Giza 96 x Australy showed significant desirable SCA effect for most characters. Conclusion: relative water content %, osmotic pressure, chlorophyll and carotenoids content indicates better availability of water in the cell, which increases the photosynthetic rate. Also, the higher level of proline accumulation in the leaves which was recorded under deficit water suggests that the production of proline is probably a common response of plant under water deficit conditions.

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