The importance of storage and redistribution in vascular plants

Merchant, Andrew

doi:10.1093/treephys/tpw011

Cited by 4 publications

(3 citation statements)

References 41 publications

(35 reference statements)

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“…Drought has been suggested as the main cause of plant mortality (McDowell 2011;Ryan 2011;Čater 2015). One of the main future challenges for the plants would be adaptation to changes in their environment as it will be crucial for their survival (Merchant 2016). Our study showed that sessile oak coppice sprouts are advantageous over seedlings, as they showed the better water status during the entire measurement period, regardless of weather conditions (Figs 5 and 6).…”

Section: Discussionsupporting

confidence: 50%

Transpiration and water potential of young Quercus petraea (M.) Liebl. coppice sprouts and seedlings during favourable and drought conditions

Stojanović¹,

Szatniewska²,

Kyselová³

et al. 2017

J. For. Sci.

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Stojanović M., Szatniewska J., Kyselová I., Pokorný R., Čater M. (2017): Transpiration and water potential of young Quercus petraea (M.) Liebl. coppice sprouts and seedlings during favourable and drought conditions. J. For. Sci., 63: 313-323.Increased frequency and intensity of drought events consequently affect oak high forests with the process of further decline, compromised growth and questionable natural regeneration. To overcome such difficulties, new adaptive strategies are required. Coppicing, as the oldest way of forest management, might provide some solutions. In our study two contrasting management systems, sessile oak coppice and high forest, were compared at the initial stages of regeneration and forest development. The transpiration of young oak sprouts and seedlings was monitored using sap flow systems during the 2015 growing season. The study of transpiration also included leaf water potential measurements during three measurement campaigns with contrasting weather conditions. Coppice sprouts transpired significantly more than seedlings on the individual tree and stand level during the entire growing season 2015; particularly large differences were observed during drought conditions. Coppice sprouts experienced lower water limitations due to the voluminous and deeper root system as indicated by leaf water potential results. Presented results attribute young coppices as one of the promising adaptable forest management types with a better adaptive strategy at the extreme sites under water limiting conditions.

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Section: Discussionsupporting

confidence: 50%

Transpiration and water potential of young Quercus petraea (M.) Liebl. coppice sprouts and seedlings during favourable and drought conditions

Stojanović¹,

Szatniewska²,

Kyselová³

et al. 2017

J. For. Sci.

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“…Ultimately, all substrate utilized for below‐ground autotrophic respiration is produced via photosynthesis, so the two processes are inextricably linked. We do not yet fully understand the process of carbohydrate allocation to roots and whether NSC storage is passive or active (Dietze et al ., ; Hartmann & Trumbore, ; Merchant, ). It is possible that recently assimilated carbohydrates may be preferentially used as the substrate for below‐ground autotrophic respiration, even in species with large root NSC reserves.…”

Section: Discussionmentioning

confidence: 99%

Stored root carbohydrates can maintain root respiration for extended periods

Aubrey

Teskey

2017

New Phytologist

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Tight coupling between below-ground autotrophic respiration and the availability of recently assimilated carbon (C) has become a paradigm in the ecophysiological literature. Here, we show that stored carbohydrates can decouple respiration from assimilation for prolonged periods by mobilizing reserves from transport roots to absorptive roots. We permanently disrupted the below-ground transfer of recently assimilated C using stem girdling and root trenching and measured soil CO efflux for over 1 yr in longleaf pine (Pinus palustris), a species that has large reserves of stored carbohydrates in roots. Soil CO efflux was not influenced by girdling or trenching through the 14-month observation period. Stored carbohydrate concentrations in absorptive roots were not affected by the disrupted supply of current photosynthate for over 1 yr; however, carbohydrate concentrations in transport roots decreased. Our results indicate that root respiration can be decoupled from recent canopy assimilation and that stored carbohydrates can be mobilized from transport roots to absorptive roots to maintain respiration for over 1 yr. This refines the current paradigm that canopy assimilation and below-ground respiration are tightly coupled and provides evidence of the mechanism and dynamics responsible for decoupling the above- and below-ground processes.

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“…C storage organs, varying depending on the season [28], play a key role in annual and seasonal metabolism and growth variations in WPs [26], as it represents resources that build up in the plant and can be mobilized in the future. This is especially true in deciduous species where in spring remobilization of reserves is necessary for budburst and growth of new leaves, allowing functional photosynthesis [29]. N is stored before leaf fall.…”

Section: Carbon Nitrogen and Water In Wp Declines: Fueling And Fluxes...mentioning

confidence: 99%