Heterosis and Combining Ability Estimates in F<sub>2</sub> Flax Populations as Influenced by Plant Density<sup>1</sup>

Shehata, A. H.; Comstock, V. E.

doi:10.2135/cropsci1971.0011183x001100040021x

Cited by 16 publications

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“…These results revealed that additive effect played greater role than non-additive gene effects in the inheritance of seed weight/plant and its two components (1000-seed weight and number of seeds/capsule). Similar results were reported by Shehata and Comstock (1971), Patil and Chopde (1981), Abo-Kaied et al, (2007) and Amany El-Reffaie, (2007).…”

Section: -2-seed Weight Per Plant and Its Componentssupporting

confidence: 88%

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Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

El-Refaie

Hussein

2012

Journal of Plant Production

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The present investigation was conducted using six flax genotypes with their 15 F2 crosses grown under two environments {normal soil (E1= Kafr El-Hamam-Shrkia Governorate) and saline soil (E2= Tag El-Ezz,-El Dakahlia Governorate)} to determine the combining ability and gene action of some agronomic flax characters in these entries (parents and their crosses). In 2009/10 season, the six parents { P1= Giza 8, P2 (S.402/1) , P3 (S.420/140/5/11), P4 (S.421/43/14/7), P5 (S.533/39/5/3) and P6 (Daniela)} as well as their 15 progenies were sown in first week of November to evaluated in a randomized complete block design with three replicates at the two above-mentioned locations. High ratio of GCA/SCA revealed that additive played greater role than nonadditive genetic effects in the inheritance of straw weight and its components as well as seed weight, 1000-seed weight and number of seeds/capsule under the two environments and combined analysis. On the other hand, both additive and nonadditive types of gene action were involved in the inheritance of number of capsules/plant. Mean squares of interaction between environment and both types of combining ability for most studied traits revealed that the magnitude of both additive and non-additive types of gene action varied from environment to another. Whereas the non-additive genetic effects are more influenced by saline environment than additive effects in each of straw weight, plant height, technical stem length, seed weight, 1000-seed weight and number of seeds per capsule. While, additive gene effects were much more influenced by saline environment than non-additive effects for number of capsules per plant. P5(S.533/39/5/3) exhibited good general combining ability effects for straw weight per plant and its two important components; plant height and technical stem length in addition P2 for both seed weight and 1000-seed weight as well as P1 for 1000-seed weight under the two environments and combined data. For Sij effects, one cross (P5P6) which exhibited positive significant SCA effects for straw weight per plant and its components as well as seed weight per plant and number of capsules per plant in addition three crosses (P1xP3, P1xP6 and P4xP6) for 1000-seed weight under the two environments and combined analysis. Therefore, these crosses are suitable in breeding program for increasing the previous characters. The correlation between cross means and their SCA values was significant and positive for straw weight and its components as well as seed yield and its two important components, number of capsules per plant and 1000-seed weight indicating that high performing crosses were high specific combinations.

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Section: -2-seed Weight Per Plant and Its Componentssupporting

confidence: 88%

“…On the other hand, many studies investigated combining ability in flax under normal conditions, i.e. Shehata and Comstock (1971), Foster et al, (1998), Patil and Chopde (1981), Patil, et al, (1997), Abo-Kaied (2002), Abo-Kaied (2006) and Amany El-Reffaie (2007).…”

Section: Introductionmentioning

confidence: 99%

Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

El-Refaie

Hussein

2012

Journal of Plant Production

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“…Interactions between cultivars and yield structure were described repeatedly (YERMANOS and WORKER 1964, SHEBATA and COMSTOCK 1971, PATIL and CHOPDE 1981. CULBERTSON (1954) could show that quantitatively inherited seed weight was governed by both, additive and dominance effects.…”

Section: Discussionmentioning

confidence: 96%

Phenotypic Plasticity in Growth and Yield Components of Linseed (Linum usitatissimum L.) in Response to Spacing and N‐Nutrition*

Diepenbrock¹,

Pörksen²

1992

J Agronomy Crop Science

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During three years of testing (1988–1990) the effects of plant density (200, 400, 800 and 1200 plants/m2) and nitrogen fertilization (40 kg/ha N and 80 kg/ha N) on yield and yield physiology of linseed (Linum usitatissimum L. cv. Atalante) were tested on two locations both representing the cool humide climate of Schleswig‐Holstein, Northern Germany, but differing in soil type (free draining sandy loam soil and poor sandy soil). On sandy loam soil yields were two‐fold as high as on poor sandy soil. Doubling of the N‐dose from 40 to 80 kg/ha N was effective in the better soil conditions, exclusively. It could be clearly demonstrated that stand establishment widely governed variation in yield. Independently of location and N‐nutrition, the 400 plants/ m2variant led to considerably high seed yields while narrow stands resulted in significantly lower yields. The overall highest yield (24.4 dt/ha) was established when the N‐dose of 80 kg/ha was combined with 400 plants/ m2. Total dry matter accumulated progressively from 49 to 63 days after field emergence (DAE). During this phase, start of the flowering period occurred. Hence, accelerated vegetative growth and reproductive development proceeded simultaneously. Increasing plant density resulted in higher rates of linear growth (LGR) and higher maximum growth rates (MGR). On the other hand, duration of linear growth rate (DLGR) decreased and day of maximum growth rate (MGRD) was reached much earlier in the same conditions. Shoot diameter was under plain control of stand density from 49 days after field emergence (DAE) to maturity. Plants from stands with extremely low competition revealed stem diameters of abt. 3.5 mm in maximum. Extremely narrow stands generated individuals not even reaching 2 mm in diameter. Increasing plant density caused a sharp decrease in net assimilation rate (NAR). This reaction was mainly controlled by competition rather than environment as no differences were proved between the two locations. NAR was measured at two stages of development, start of stem elongation and full flowering. At both stages, NAR was highest at 200 and 400 plants/m2, respectively. Chlorophyll content of leaves was assessed as an indicator of source activity for assimilate production. Pigment contents of upper and lower leaves were analysed at five sampling dates as related to stand density and N‐fertilization. After relatively low levels were found at 21 DAE, chlorophyll accumulation was raised until full flowering (63 DAE) and then slowed down during the reproductive period. Low population stands and enhanced N‐nutrition excelled by comparatively high chlorophyll contents and, with the exception of day 21, apical leaves were superior to basal ones. Independently of stand density, the higher N‐supply resulted in higher chlorophyll contents at all stages and during the post‐flowering period the loss of chlorophyll was delayed significantly on both levels of the vertical leaf canopy. As early as full flowering occurred, capsules were already formed to some extent ...

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“…[Effet du taux de semis sur certains caractdres de la plante et de la semence de nouveaux cultivars de lin.l (Gubbels 1978) Shehata and Comstock (1971), who recorded a highly signiflcant genotype x plant density interaction for yield in Ft populations.…”

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Effect of Seeding Rate on Plant and Seed Characteristics of New Flax Cultivars

Gubbels¹,

Kenaschuk²

1989

Can. J. Plant Sci.

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Heterosis and Combining Ability Estimates in F₂ Flax Populations as Influenced by Plant Density¹

Cited by 16 publications

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Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

Phenotypic Plasticity in Growth and Yield Components of Linseed (Linum usitatissimum L.) in Response to Spacing and N‐Nutrition*

Effect of Seeding Rate on Plant and Seed Characteristics of New Flax Cultivars

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Heterosis and Combining Ability Estimates in F2 Flax Populations as Influenced by Plant Density1

Cited by 16 publications

References 0 publications

Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

Phenotypic Plasticity in Growth and Yield Components of Linseed (Linum usitatissimum L.) in Response to Spacing and N‐Nutrition*

Effect of Seeding Rate on Plant and Seed Characteristics of New Flax Cultivars

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Heterosis and Combining Ability Estimates in F₂ Flax Populations as Influenced by Plant Density¹