Photosynthesis and Leaf Water, Carbohydrate, and Hormone Status during Rooting of Stem Cuttings of Acer rubrum

Smalley, Timothy J.; Dirr, Michael A.; Armitage, Allan M.; Wood, Bruce W.; Teskey, Robert O.; Severson, R. F.

doi:10.21273/jashs.116.6.1052

Cited by 33 publications

(20 citation statements)

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“…The large increase in g s of the expanding leaves (L3) on cuttings of C. maxima is unusual as most published reports show a decrease in g s following severance (Gay and Loach 1977, Smalley et al 1991, Newton and Jones 1993, Hoad and Leakey 1996). Usually, g s remains low until the cutting has rooted (Smalley et al 1991, Svenson 1995). In the present study, ψ leaf was maintained above −0.5 MPa in cuttings, even in the absence of adventitious roots.…”

Section: Discussionmentioning

confidence: 96%

“…show a decrease in g s following severance (Gay and Loach 1977, Smalley et al 1991, Newton and Jones 1993, Hoad and Leakey 1996. Usually, g s remains low until the cutting has rooted (Smalley et al 1991, Svenson 1995.…”

Section: Discussionmentioning

confidence: 99%

“…Initially, severance from the stock‐plant severely disrupts leaf water status (Gay and Loach 1977, Smalley et al 1991, Svenson 1995). Stomatal conductance (g s ) and photosynthesis are normally suppressed and then slowly increase as a favourable leaf water balance is restored after adventitious root development (Svenson 1995, Hoad and Leakey 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Initially, severance from the stock-plant severely disrupts leaf water status (Gay and Loach 1977, Smalley et al 1991, Svenson 1995. Stomatal conductance (g s ) and photosynthe-Abbre6iations -ABA, abscisic acid; CE, controlled environment; g rel.…”

Section: Introductionmentioning

confidence: 99%

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Effects of leaf wetting and high humidity on stomatal function in leafy cuttings and intact plants ofCorylus maxima

Fordham

Harrison-Murray

Knight

et al. 2001

Physiologia Plantarum

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When rooted cuttings of Corylus maxima Mill. cv. Purpurea are moved from the wet and humid conditions of the rooting environment, the leaves frequently shrivel and die. Since the newly formed adventitious root system has been shown to be functional in supplying water to the shoot, stomatal behaviour in C. maxima was investigated in relation to the failure to prevent desiccation. Stomatal conductance (gs) in expanding leaves (L3) of cuttings increased almost 10-fold over the first 14 days in the rooting environment (fog), from 70 to 650 mmol m-2 s-1. In contrast, gs of expanded leaves (L1) changed little and was in the region of 300 mmol m-2 s-1. Midday leaf water potential was much higher in cuttings than in leaves on the mother stock-plant (-0.5 versus -1.2 MPa) even before any roots were visible. Despite this, leaf expansion of L3 was inhibited by >50% in cuttings and stomata showed a gradual reduction in their ability to close in response to abscisic acid (ABA). To determine whether the loss of stomatal function in cuttings was due to severance or to unnaturally low vapour pressure deficit and wetting in fog, intact plants were placed alongside cuttings in the rooting environment. The intact plants displayed reductions in leaf expansion and in the ability of stomata to close in response to dark, desiccation and ABA. However, in cuttings, the additional effect of severance resulted in smaller leaves than in intact plants and more severe reduction in stomatal closure, which was associated with a 2.5-fold increase in stomatal density and distinctively rounded stomatal pores. The similarities between stomatal dysfunction in C. maxima and that observed in many species propagated in vitro are discussed, as is the possible mechanism of dysfunction.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of leaf wetting and high humidity on stomatal function in leafy cuttings and intact plants ofCorylus maxima

Fordham

Harrison-Murray

Knight

et al. 2001

Physiologia Plantarum

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“…The differences may be due to the stress (VPDair) under which the studies were conducted. It is not clear whether the increased capacity for photosynthetic gas exchange in cuttings is driven by improved water relations or some other signal (i.e., hormonal-Hubick et al, 1988;Smalley et al, 1991;source/sink-Feldmann et al, 1989;Loach and Gay, 1979).…”

Section: Discussionmentioning

confidence: 99%

Transpiration Capacity in Poinsettia Cuttings at Different Rooting Stages and the Development of a Cutting Coefficient for Scheduling Mist

Wilkerson¹,

Gates

Zolnier³

et al. 2005

jashs

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Rooting stage, transpiration capacity, and relative water content were measured in cuttings every 5 days for 25 days. Cell divisions in phloem parenchyma were evident between 5 and 10 days after sticking, organized subcuticular root primordia were present between 10 and 12 days, and roots emerged between 12 and 15 days. Transpiration was measured in poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch `Freedom Dark Red') cuttings under light or dark conditions at increasing vapor pressure deficit (VPDair) levels during different stages of rooting. Transpiration capacity did not increase until roots emerged on the cuttings. Light had a significant impact on transpiration rates only after roots emerged. Light was more significant than VPDair for determining actual transpiration. Between visible rooting (15 days) and 25 days, increase in total root length was linear (r2 = 0.92) and significantly correlated with transpiration (r2 = 0.98). Transpiration capacity increased after visible rooting, but did not significantly increase under non-misted conditions until cuttings were well-rooted and had a total root length >50 cm (18 days after sticking). Relative water content measured before and after entering the transpiration chamber confirmed that cuttings were only able to take enough water from the medium to continue sustained transpiration after 18 days. A cutting coefficient was developed from transpiration data to modify the misting interval for dynamic controlled misting. Greenhouse studies showed a 55% or greater reduction in water use with dynamic control compared to constant static or stepped down static control. Rooting performance was unaffected by misting interval. Foliar nutrition was significantly reduced in all cuttings after 7 days in the mist bench, but changes in foliar elemental content were not correlated with misting interval.

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Role of Endogenous Cytokinins in Rooting of Etiolated and Light-Grown Oak Cuttings

Eshed

Riov

1997

Biology of Root Formation and Development

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Photosynthesis and Leaf Water, Carbohydrate, and Hormone Status during Rooting of Stem Cuttings of Acer rubrum

Cited by 33 publications

References 0 publications

Effects of leaf wetting and high humidity on stomatal function in leafy cuttings and intact plants ofCorylus maxima

Effects of leaf wetting and high humidity on stomatal function in leafy cuttings and intact plants ofCorylus maxima

Transpiration Capacity in Poinsettia Cuttings at Different Rooting Stages and the Development of a Cutting Coefficient for Scheduling Mist

Role of Endogenous Cytokinins in Rooting of Etiolated and Light-Grown Oak Cuttings

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