Genetic Differences in the Root Regeneration of Radiata Pine

Nambiar, E. K. S.; Cotterill, P. P.; Bowen, G. D.

doi:10.1093/jxb/33.1.170

Cited by 28 publications

(11 citation statements)

References 3 publications

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“…Another possible source of the observed R w /R t variation not explained by the response surface represented in Fig. 4 is the genetic variability previously observed for root growth potential at family (Nambiar et al 1982) or clonal (Lamhamedi et al 2000) levels.…”

Section: Discussionmentioning

confidence: 94%

Relationships between frost hardiness, root growth potential, and photosynthesis of nursery-grown white spruce seedlings

Carles

Lamhamedi²,

Stowe

et al. 2011

Annals of Forest Science

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& Context Root growth is a characteristic to which nursery personnel is particularly attentive. The increase in root growth of white spruce seedlings in the autumn relies on the current season's photosynthates. Needle hardening or a decrease in the mass of photosynthetically active foliage as a result of early frost may negatively affect the seedling's photosynthetic capacity and its ability to fuel root growth. & Aims This study evaluated the relationship between cold hardiness, root growth potential, and photosynthesis of 2-year-old white spruce seedlings. & Methods At the end of their second growing season under standard cultural practices in a forest nursery, seedlings were hardened under natural conditions of photoperiod and temperature. After being subjected to artificial freezing tests on four sampling dates during the fall, the seedlings were compared for cold tolerance and recovery of gas exchange. & Results The effect of artificial freezing treatments on seedling photosynthesis varied with frost intensity and degree of needle hardening. The mass of new roots formed over a 21-day cultivation test period following the freeze tests was positively related to the photosynthetic capacity of the seedlings and negatively related to the proportion of damaged needles. & Conclusion These results imply that autumnal cold damage to needles directly affects seedling root growth and emphasize the importance of maintaining seedlings in an environment favorable for photosynthesis during the fall to promote root growth.

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Section: Discussionmentioning

confidence: 94%

Relationships between frost hardiness, root growth potential, and photosynthesis of nursery-grown white spruce seedlings

Carles

Lamhamedi²,

Stowe

et al. 2011

Annals of Forest Science

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“…Segundo os autores, a extensão de raízes finas é uma característica intrínseca (fator hereditário) do genótipo, a qual é estreitamente relacionada com o seu comportamento nutricional, seu potencial produtivo e sua capacidade de adaptação às condições de estresse ambiental. Nambiar et al (1982) ratificam a alta herdabilidade dos parâmetros radiciais e seu potencial para o melhoramento genético.…”

Section: Comprimento De Raízes Finasunclassified

Estimativa da biomassa e do comprimento de raízes finas em Eucalyptus urophylla S.T. Blake no município de Santa Maria-RS

2003

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O objetivo do presente trabalho foi estimar a biomassa e o comprimento de raízes finas (< 2 mm de diâmetro), em diferentes profundidades do solo, para a espécieEucalyptus urophylla S.T. Blake, com 10 anos de idade. O estudo foi realizado no município de Santa Maria-RS, no campus da Universidade Federal de Santa Maria. O talhão plantado com eucalipto tem 27 m de comprimento por 14 m de largura, em espaçamento 3 x 2 m. Foram amostrados quatro monolitos de 25 x 25 x 60 cm. Os monolitos foram divididos em seis perfis geométricos, nas profundidades de 0-10, 10-20, 20-30, 30-40, 40-50, 50-60 cm. A separação das raízes do solo foi por meio de um conjunto de duas peneiras (2 e 1 mm de malha) e jatos d'água. Na determinação do comprimento de raízes foi utilizado o método de intersecção, produzindo fotos com o uso de scanner. Os resultados revelaram alta concentração das raízes finas nos primeiros 20 cm de solo. A biomassa total de raízes finas encontradas para o Eucalyptus urophylla foi de 1.451,6 kg/ha, devendo ser ressaltado que 57,9% estavam concentradas nos primeiros 20 cm de solo. Constatou-se que o comprimento total de raízes finas foi de 27.968,9 km/ha e que 64,3% destes estavam nos primeiros 20 cm de profundidade.

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“…Cold hardiness and RGP variance statistics were averaged over the entire deacclimation period. Others have observed large differences in responses for various physiological attributes among genetically related groups of conifers (Nambiar et al 1982, Colombo et al 1992, Deans et al, 1992, as well as relatively low within-clone variability in these responses (Lundkvist et al 1992). Thus, the physiological and statistical behavior of the groups included in this experiment were viewed as reasonable.…”

Section: Physiological Responsesmentioning

confidence: 79%

Use of clones increases the power of physiological experiments on coastal Douglas-fir

Burr¹,

Tinus²

1996

Physiol Plant

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Use of clones increases the power of physiological experiments on coastal Douglas-fir. -Physiol. Plant. 96: 45S-466.The statistical benefit of reduced variability in experiments with clones was quantified with cold hardy Douglas-fir (Pseudolsuga meniiesii van menzlesii [Mirb. ] Franco) ramets from six clones frorB a single full-sib family and a check group of open-pollinated seedlings from a bulk seed collection from the same geographic seed source. Ail groups were cold deacdimated under controlled conditions. The variability in response for physiological attributes (cold hardiness, root growth potential, days to budbreak) was compared within and among groups by using statistical power analyses. Sample sizes required to detect sigtiificant differences of varying magnitude between two hypothetical treatment means were calculated. Differences among clones in the average response exhibited for each physiological attribute were large, but within-clotie variability was low, relative to the check group of seedlings. Selection of plant material for a hypothetical experiment from this population of several identifiable clones would have consistently resulted in an experiment with greater power than an experiment using these ramets without the clone identities. From a statistical perspective, the best approach tO' reduce the number of replicates needed to detect treatment differences was selection of experimental plant material from a single clone, especially with prior screening for the most homogeneous clone for the physiological attributes and time periods of interest. However, from a biological perspective, use of a single clone should be approached with caution because of the lack of representation of natural population variability and the possible itiability to broadly apply experimental results.

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Genetic Differences in the Root Regeneration of Radiata Pine

Cited by 28 publications

References 3 publications

Relationships between frost hardiness, root growth potential, and photosynthesis of nursery-grown white spruce seedlings

Relationships between frost hardiness, root growth potential, and photosynthesis of nursery-grown white spruce seedlings

Estimativa da biomassa e do comprimento de raízes finas em Eucalyptus urophylla S.T. Blake no município de Santa Maria-RS

Use of clones increases the power of physiological experiments on coastal Douglas-fir

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