Environmental variability within inbred lines and single crosses of maize

Shank, D. B.; Adams, M. W.

doi:10.1007/bf02985341

Cited by 35 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is tempting to regard these results as providing an example of developmental homeostasis, i.e. constancy of attributes of adaptive value as a consequence of physiological flexibility (Shank and Adams, 1960;Geiger et al, 1996). The property under consideration in this instance is sugar accumulation by sugarcane stems.…”

Section: Discussionmentioning

confidence: 99%

Effects of treatments potentially influencing the supply of assimilate on its partitioning in sugarcane

Pammenter

Allison²

2002

Journal of Experimental Botany

View full text Add to dashboard Cite

Two pot experiments and one field experiment were conducted on sugarcane to assess the effects of treatments expected to change total carbon assimilation on the partitioning of assimilate. In the first experiment pots of cultivars CP and N14 were arranged to simulate normal field spacing. At 5 months, plants were partially defoliated or left intact. In the subsequent four months, defoliation resulted in a small (not significant) decrease in total dry mass increment; it increased the proportional partitioning of assimilates to leaves in N14, whilst in CP it increased the proportional partitioning to stems. In both cultivars defoliation increased proportional allocation to non-structural dry matter, and thus sucrose, in the stem. In the second experiment pots of cv. CP were grown at normal spacing for 4 months, then left untreated, shaded, or placed further apart. During the subsequent four months shading decreased total dry matter increment, but increased proportional partitioning to the stems, and within stems to non-structural dry matter, and so sucrose. Widened spacing increased total assimilation, but decreased proportional allocation to stems; partitioning within the stems was not affected. In the field experiment plants of both cultivars were partially defoliated at 6 months, or left intact. Defoliation resulted in only a very small decrease in stem dry mass increment during the subsequent four months (leaves were not measured). Within the stem partial defoliation caused proportionally increased partitioning to non-structural dry matter, hence to sucrose. The results suggest that sucrose storage receives priority in the allocation of assimilate, rather than representing the accumulation of assimilate not required for vegetative growth.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of treatments potentially influencing the supply of assimilate on its partitioning in sugarcane

Pammenter

Allison²

2002

Journal of Experimental Botany

View full text Add to dashboard Cite

show abstract

“…Leon (1991) found hybrid winter oil seed rape (Brassica napus L. var. Shank and Adams (1960) and Schnell and Becker (1986) observed increases in the stability of corn (Zea mays L.) hybrids over the inbred population for several measured traits. Stelling et al (1994) observed a 23% improvement in yield stability for the hybrid population when compared with the pure-line population in faba bean (Vicia faba L.).…”

Section: Researchmentioning

confidence: 95%

Impact of Heterozygosity and Heterogeneity on Cotton Lint Yield Stability

Cole

Bowman

Bourland³

et al. 2009

Crop Science

View full text Add to dashboard Cite

In the last 8 yr, cotton (Gossypium hirsutum L.) growers in North Carolina have experienced variations in the year-to-year lint yield averages that range from a 56% increase to a 49% decrease. This variability results in wild fl uctuations in income and a desire for more stable yields. Genetic structure may contribute to stability. This study was conducted to determine the impact of heterozygosity and heterogeneity on lint yield stability. Lint yield was observed in 18 environments over 3 yr among four population types that included homozygous lines grown in pure stands, homozygous lines grown in blended stands, hybrids grown in pure stands, and hybrids grown in blended stands. Comparisons were made using trait means, standard deviations, and the coeffi cients of variation (CVs) calculated over environments. There was no signifi cant difference between lines grown in pure stands and blended lines with respect to yield or stability. Hybrids had a lower CV (were more stable) than homozygous lines. This stability was attributed to the hybrids and blends of hybrids out-yielding the homozygous lines and blends of homozygous lines in the low-yielding environments, but having similar yields in the high-yielding environments. These results do not support growing blends to increase stability or yield; however, growing hybrid cultivars could result in increased yields while reducing variability compared with current production practices.

show abstract

“…These changes are to be expected because certain environments can favour one parental component over another, not unlike that which occurs in naturally open-pollinated populations. The effect of heterozygosity and heterogeneity on performance and yield stability has been studied extensively in maize (Shank and Adams 1960;Reich and Atkins 1970;Schnell and Becker 1986). Yield stability is often referred to in terms of buffering.…”

Section: Future Researchmentioning

confidence: 99%

The utilization of heterosis for seed yield in hybrid and synthetic cultivars of summer turnip rape

Falk¹,

Rakow²,

Downey³

1998

Can. J. Plant Sci.

View full text Add to dashboard Cite

. 1998. The utilization of heterosis for seed yield in hybrid and synthetic cultivars of summer turnip rape. Can. J. Plant Sci. 78: 383-387. Hybrids of summer turnip rape (Brassica rapa L. syn. B. campestris L.) have been shown to exhibit high levels of heterosis. This study was undertaken to determine whether the heterosis for seed yield observed in hybrids could be captured by synthetic cultivars of turnip rape. The agronomic performance of reciprocal inter-cultivar hybrids and their corresponding two-component synthetics was studied using four turnip rape cultivars. Hybrid seed was produced by hand pollination in the greenhouse and Syn 1 seed was produced by mixing equal proportions of each parent to form the base seed (Syn 0 ) of each synthetic, and planting these in isolation in the field. The seed yield of hybrids, synthetics and parents were similar in 1985 while in 1986, hybrids yielded 25% and synthetics 23% more than parents. Actual versus predicted synthetic yields were similar except for one synthetic, Echo-Torch in 1986, where the actual yield exceeded the predicted value. Hybrid yields may have been underestimated by the chosen prediction method and therefore the yield potential of hybrids would be greater than for synthetics in turnip rape. However, until a suitable pollination control system is developed in this species, synthetic cultivars are a viable alternative to hybrids. Nous avons observé, chez quatre cultivars de navette, le comportement agronomique d'hybrides simples réciproques de cultivars et de leurs synthétiques correspondants. Les semences hybrides étaient produites en serre par pollinisation manuelle et les semences Syn 1 étaient le produit de la culture au champ en condition d'isolement des semences Syn 0 formées du mélange en proportion, égale, des graines de chaque parent. Le rendement grainier des hybrides synthétiques et des cultivars parentaux était comparable en 1985, mais en 1986 les hybrides produisaient 25 % et les synthétiques 23 % de plus que les cultivars parentaux. Les rendements réels et prédits des synthétiques correspondaient, sauf en 1986 pour le synthétique Echo-Torch dont le rendement réel dépassait les prédictions. Il est possible que la méthode de prédiction choisie ait sousestimé le rendement des hybrides dans le cas de la navette d'été et que les potentialités de rendement des hybrides soient effectivement plus grandes que celles des synthétiques. Mais, en attendant la mise au point d'un système convenable de maîtrise de la pollinisation pour cette espèce, les cultivars synthétiques constituent une alternative valable et viable aux hybrides.

show abstract

Environmental variability within inbred lines and single crosses of maize

Cited by 35 publications

References 14 publications

Effects of treatments potentially influencing the supply of assimilate on its partitioning in sugarcane

Effects of treatments potentially influencing the supply of assimilate on its partitioning in sugarcane

Impact of Heterozygosity and Heterogeneity on Cotton Lint Yield Stability

The utilization of heterosis for seed yield in hybrid and synthetic cultivars of summer turnip rape

Contact Info

Product

Resources

About