Untitled

Menzies, M. I.; Holden, D. G.; Klomp, B.K.

doi:10.1023/a:1012027013173

Cited by 31 publications

(13 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…B.S.P.) and sugi (Cryptomeria japonica D. Don) (Menzies et al 2001). For a few economically important forest conifer species, an alternative vegetative, large-scale in vitro propagation technology has been developed, called somatic embryogenesis that utilizes mature or immature seed embryos as starting explants (reviewed by Klimaszewska et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Adventitious rooting of conifers: influence of physical and chemical factors

Ragonezi

Klimaszewska

Castro

et al. 2010

Trees

View full text Add to dashboard Cite

In conifers, vegetative propagation of superior genotypes is the most direct means for making large genetic gains, because it allows a large proportion of genetic diversity to be captured in a single cycle of selection. There are two aims of vegetative propagation, namely large-scale multiplication of select genotypes and production of large numbers of plants from scarce and costly seed that originates from controlled seed orchard pollinations. This can be achieved, in some species, either through rooted cuttings or rooted microshoots, the latter regenerated through tissue culture in vitro. Thus far, both strategies have been used but often achieved limited success mainly because of difficult and inefficient rooting process. In this overview of technology, we focus on the progress in defining the physical and chemical factors that help the conifer cuttings and microshoots to develop adventitious roots. These factors include plant growth regulators, carbohydrates, light quality, temperature and rooting substrates/media as major variables for development of reliable adventitious rooting protocols for different conifer species.

show abstract

Section: Introductionmentioning

confidence: 99%

Adventitious rooting of conifers: influence of physical and chemical factors

Ragonezi

Klimaszewska

Castro

et al. 2010

Trees

View full text Add to dashboard Cite

show abstract

“…For this reason, various other methods can be used to reduce the need to freeze-protect container seedlings using irrigation. These methods include (1) outplanting seedlings before the first killing freeze; (2) packing and storing seedlings before December 15; (3) growing cold-sensitive species at nurseries in frost-free zones; (4) applying shade cloth (Menzies et al 2001); and (5) moving seedlings inside greenhouses or into protected shelters. One forest company has a goal of planting all container seedlings by mid-October.…”

Section: Freeze Protectionmentioning

confidence: 99%

Irrigation in pine nurseries

South

Nadel

2021

REFOR

View full text Add to dashboard Cite

This review provides information and opinions about irrigation practices in pine nurseries. Even when nurseries receive more than 15 mm of rainfall week-1, managers irrigate seedbeds to increase germination, increase seed efficiency, and increase root growth. In the southern United States, a 7-month old pine seedling in an outdoor nursery typically receives 2 to 6 kg of water supplied from either sprinklers (39 nurseries) or center-pivot irrigation (12 nurseries). Most nursery managers do not intentionally subject the crop to moisture stress, since most reforestation sites receive adequate rainfall, and many studies show that reducing root mass does not increase seedling performance. In fact, nursery profits can be reduced by more than $13,000 ha-1 when deficit irrigation reduces average seedling diameter by 1 mm. Although some researchers believe that failure to properly drought stress pine seedlings might increase outplanting mortality by up to 75%, research over the past 40 years does not support that myth. When pine seedlings average 5 mm (at the root-collar), water stress is not a reliable method of increasing tolerance to an October freeze event. In several greenhouse trials, researchers grew and tested seedlings that nursery managers would classify as culls (i.e., dry root mass < 0.5 g). Unfortunately, it is common for researchers to make irrigation recommendations without first developing a water-production function curve.

show abstract

“…In Chile, due to its importance, rooting of woody cuttings is being used to capture the genetic gain and produce large amounts of plant material from "superior clones", which are selected from control-pollinated orchards [1]. Unfortunately, this practice is severely affected by the age of rootstock plants; being widely known that tree maturation is one of the most important obstacles in the development of selected clones [2] [3].…”

Section: Introductionmentioning

confidence: 99%

“…Although it has been suggested that this decline could be due to the loss in competence at the cellular level [11], the intrinsic mechanism behind the loss of morphogenetic competence due to ageing has not been researched in pine species. Most studies have been focused mainly in morphological traits [1] [12] and hormone action [13]- [15], but due to maturation implies a loss in morphogenetic capability, it is highly likely that this phenomenon causes changes in gene and protein expression. Some genes have been proposed as regulators of the rooting process in Pinus contorta hypocotyls: two S-adenosylmethionine genes (PcSAMS1 and PcSAMS2) [16], a PINHEAD/ZWILLE gene [17], SCARECROW-LIKE gene [18] and a SHORT-ROOT gene [19].…”

Section: Introductionmentioning

confidence: 99%

Changes in Gene Expression in Needles and Stems of <i>Pinus radiata</i> Rootstock Plants of Different Ontogenic Age

Álvarez¹,

Valledor²,

Sáez³

et al. 2016

AJPS

View full text Add to dashboard Cite

A major problem in forest clonal productivity is the loss of morphogenetic capability with the increasing age of plants. However, despite of the importance of loss of morphogenetic competence, very little research has been done about the underlying mechanisms involved in this process. For this reason, a gene expression analysis using dot blot technique was performed in needles and stems of 1-and 3-year old Pinus radiata rootstock plants with a proved decrease in morphogenetic competence. Needles of one year old rootstock plants showed a higher number of up-regulated in genes mainly corresponding to photosynthesis and protein synthesis, degradation and modification, reflecting a higher number of active pathways in younger hedges, contrary to the older ones. Gene expression profiles found in stems are in agreement with those found in needles, indicating more active pathways in younger rootstock plants than in older ones. Several transcripts regulating transcription and translation were up-regulated in young competent tissues. Three-year-old stems presented an increase in the expression of an ethylene response factor, involved in plant organ senescence, indicating that pathways involved in senescence and ageing might inhibit the adventitious root formation, as in the older cuttings.

show abstract

Untitled

Cited by 31 publications

References 6 publications

Adventitious rooting of conifers: influence of physical and chemical factors

Adventitious rooting of conifers: influence of physical and chemical factors

Irrigation in pine nurseries

Changes in Gene Expression in Needles and Stems of <i>Pinus radiata</i> Rootstock Plants of Different Ontogenic Age

Contact Info

Product

Resources

About

Untitled

Cited by 31 publications

References 6 publications

Adventitious rooting of conifers: influence of physical and chemical factors

Adventitious rooting of conifers: influence of physical and chemical factors

Irrigation in pine nurseries

Changes in Gene Expression in Needles and Stems of &lt;i&gt;Pinus radiata&lt;/i&gt; Rootstock Plants of Different Ontogenic Age

Contact Info

Product

Resources

About

Changes in Gene Expression in Needles and Stems of <i>Pinus radiata</i> Rootstock Plants of Different Ontogenic Age