Solar-tracking leaf movements in velvetleaf (Abutilon theophrasti)

Jurik, Thomas W.; Akey, William C.

doi:10.1007/bf00044684

Cited by 9 publications

(5 citation statements)

References 28 publications

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“…This could contribute to higher photochemical performance and better capability to use high-intensity light. Similar conclusions have been also reached in some previous studies (Ehleringer and Forseth 1980, Jurik and Akey 1994, Zhang et al 2009. The plants benefited from diaheliotropic movement to increase the potential photosynthesis as more light energy became available.…”

Section: Discussionsupporting

confidence: 88%

“…Diaheliotropism and paraheliotropism are two types of heliotropism that have been observed in many studies (Smith 1984, Koller 1986, 1990Rosa and Forseth 1995, Bielenberg et al 2003, Pastenes et al 2005, Arena et al 2008. Some previous studies have demonstrated that plants can improve their photosynthetic performance, promote carbon assimilation and water-use efficiency, and prevent light overload and blade overheating by heliotropic leaf movement (Jurik and Akey 1994, Caldas et al 1997, Bielenberg et al 2003, Liu et al 2003, Pastenes et al 2005, Arena et al 2008, Zhang et al 2009, Habermann et al 2011.…”

Section: Introductionmentioning

confidence: 98%

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Heliotropic leaf movement of Sophora alopecuroides L.: An efficient strategy to optimise photochemical performance

Zhu

Chen

et al. 2015

Photosynt.

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We studied the survival adaptation strategy of Sophora alopecuroides L. to habitat conditions in an arid desert riparian ecosystem. We examined the responses of heliotropic leaf movement to light conditions and their effects on plant photochemical performance. S. alopecuroides leaves did not show any observable nyctinastic movement but they presented sensitive diaheliotropic and paraheliotropic leaf movement in the forenoon and at midday. Solar radiation was a major factor inducing leaf movement, in addition, air temperature and vapour pressure deficit could also influence the heliotropic leaf movement in the afternoon. Both diaheliotropic leaf movement in the forenoon and paraheliotropic leaf movement at midday could help maintain higher photochemical efficiency and capability of light utilisation than fixed leaves. Paraheliotropic leaf movement at midday helped plants maintain a potentially higher photosynthetic capability and relieve a risk of photoinhibition. Our findings indicated the effective adaptation strategy of S. alopecuroides to high light, high temperature, and dry conditions in arid regions. This strategy can optimise the leaf energy balance and photochemical performance and ensure photosystem II function.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 98%

Heliotropic leaf movement of Sophora alopecuroides L.: An efficient strategy to optimise photochemical performance

Zhu

Chen

et al. 2015

Photosynt.

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“…Velvetleaf exhibits solar-tracking leaf movements that maintain leaf blade angles near perpendicular to the sun (diaheliotropism). Solartracking leaves are predicted to have an assimilatory advantage over nontracking leaves (Jurik and Akey 1994). However, this is true only at low LAI values where self-shading is minimal (Gutschick 1991).…”

mentioning

confidence: 99%

“…However, this is true only at low LAI values where self-shading is minimal (Gutschick 1991). Jurik and Akey (1994) concluded that the significance of solar tracking in competitive interactions would depend on whether the tracking ability is maintained under shaded conditions.…”

mentioning

confidence: 99%

Growth analysis and canopy architecture of velvetleaf grown under light conditions representative of irrigated Mediterranean-type agroecosystems

Steinmaus¹,

Norris

2002

Weed Science

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Velvetleaf growth and canopy architecture were compared under a range of light conditions representative of competitive and noncompetitive environments typical of irrigated Mediterranean-type agroecosystems. Velvetleaf biomass and seed production exceeded those reported in the literature. Plants grown in full light produced 1,370 g dry weight and 44,200 seeds per plant and showed low relative variability. Velvetleaf grown with corn was reduced to 21 g dry weight and 349 seeds per plant, and had high relative variability for biomass and seed numbers. Velvetleaf grown with kidney bean, intraspecific neighbors, or under shadecloth had dry weights and seed numbers that were intermediate to plants grown in full light or with corn. Relative growth rate (RGR), net assimilation rate (NAR), and leaf area ratio (LAR) were assessed utilizing Richards functions, which were fitted to the primary biomass and leaf area data by weighted regression. RGR was highest for all plants early in the season, but declined later. Dynamics of NAR and LAR appeared to be correlated with increased self-shading, shading by neighbors, leaf age, and shedding of lower canopy leaves. Dynamics of specific leaf area corresponded with light availability such that the leaves exposed to full light were thicker than those exposed to shade. The branches of plants in all treatments had random azimuths and the foliage area density was concentrated along the perimeter of the plant's canopy. Velvetleaf increased the canopy radius through extensive branching when exposed to full sunlight. Leaf area distribution and branching patterns resulted in leaf area indices of less than 1.0. Leaves maintained a perpendicular angle to the sun throughout the day, but this depended on whether leaves received a consistent directional signal from the sun and not necessarily on whether they received a high-intensity signal. When shaded, the allocation of dry matter went primarily to the stem tissue, which increased the height rather than the girth of the plants. There was a 10- to 20-d delay for allocations to seed in the case of shaded plants relative to those grown in full sunlight. In brief, velvetleaf had a wide range of growth and canopy responses to a variety of light availabilities and it should have little difficulty in becoming fully established in the irrigated agroecosystems of Mediterranean-type regions.

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“…Utvrđeno je da ona "pravi" pokrete indukovane svetlošću koji postavljaju lisnu ploču pod uglom od skoro 90° u odnosu na upad sunčevih zraka, što je poznato kao diaheliotropizam. Dakle, biljke čiji listovi su skloni fototaksijama imaju prednost pri asimilaciji i iskorišćavanju svetlosti u odnosu na one koji nemaju to svojstvo (Jurik and Akey, 1994). Međutim, to važi samo pri niskim vrednostima indeksa lisne površine, kada je samozasenjivanje minimalno (Gutschick, 1991).…”

Section: Kompetitivnostunclassified

Abutilon theophrasti Medik.: Lipica teofrastova

Vrbničanin¹,

Božić²

2017

Acta herbologica

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Solar-tracking leaf movements in velvetleaf (Abutilon theophrasti)

Cited by 9 publications

References 28 publications

Heliotropic leaf movement of Sophora alopecuroides L.: An efficient strategy to optimise photochemical performance

Heliotropic leaf movement of Sophora alopecuroides L.: An efficient strategy to optimise photochemical performance

Growth analysis and canopy architecture of velvetleaf grown under light conditions representative of irrigated Mediterranean-type agroecosystems

Abutilon theophrasti Medik.: Lipica teofrastova

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