Delayed water loss and temperature rise in floral buds compared with leaves of Brassica rapa subjected to a transient water stress during reproductive development

Guo, Yi; Chen, Sheng; Nelson, Matthew N.; Cowling, Wallace; Turner, Neil C.

doi:10.1071/fp12335

Cited by 19 publications

(35 citation statements)

References 29 publications

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“…Although the flower and small pod water potential were not measured in this study, the results are consistent with the results in Brassica rapa in which the flower bud had lower temperatures, indicative of stomatal opening, to lower soil water contents than the leaf temperature (Guo et al. ).…”

Section: Discussionsupporting

confidence: 90%

Photosynthesis is Reduced, and Seeds Fail to Set and Fill at Similar Soil Water Contents in Grass Pea (Lathyrus sativus L.) Subjected to Terminal Drought

Kong

Palta

Siddique

et al. 2014

J Agronomy Crop Science

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Keywords 13 C labelling; flower abortion; pod abortion; stomatal conductance; water stress; b-Noxalyl-L-a, b-diaminopropionic acid (b-ODAP) Correspondence AbstractGrass pea (Lathyrus sativus L.) is an indeterminate grain legume considered adapted to dry environments, but the mechanisms of its adaptation are not well understood. Grass pea plants were exposed to terminal drought from podding, and the development of water deficit was measured together with its effects on leaf photosynthesis, stomatal conductance, carbon remobilisation to the seeds, flower production and abortion, pod production and abortion, seed set, seed growth and the neurotoxin b-N-oxalyl-L-a, b-diaminopropionic acid (b-ODAP) concentration. Predawn leaf water potential (Ψ leaf ), stomatal conductance (gs), rate of leaf photosynthesis (Pn), flower production, pod production, filled pod number, seed number, seed size and yield decreased, while flower abortion, pod abortion and seed abortion increased, and the concentration of b-ODAP was unchanged under terminal drought conditions. gs and Pn began to decrease at a higher plant-available soil water content (PAWC) (67.2 AE 2.3 % and 62.9 AE 2.3 %) than Ψ leaf (43.7 AE 1.1 %). Flowers and pods ceased being produced only when the PAWC decreased below 40.1 AE 4.6 % and 35.3 AE 3.0 %, respectively, but seed set and seed growth ceased when PAWC decreased below 55.5 AE 1.6 % and 58.0 AE 3.7 %, respectively. The mobilization of 13 C labelled assimilates from the stems was greater under terminal drought than under wellwatered conditions, but the transfer to the seed was small. We conclude that seed set and seed growth decreased as the soil dried due to a reduction in current photosynthesis as a result of stomatal closure.

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Section: Discussionsupporting

confidence: 90%

Photosynthesis is Reduced, and Seeds Fail to Set and Fill at Similar Soil Water Contents in Grass Pea (Lathyrus sativus L.) Subjected to Terminal Drought

Kong

Palta

Siddique

et al. 2014

J Agronomy Crop Science

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“…, Figure S3), which follows the data presented in Guo et al. (). These results emphasise that the phenotype for drought tolerance in B. rapa is more related to temperature control in reproductive tissue than in leaf tissue.…”

Section: Discussionsupporting

confidence: 89%

“…The previous research of Guo et al. () showed a delayed increase in bud temperature compared with leaf temperature, suggesting that BTD during drought stress may be a useful screening tool for drought tolerance in B. rapa during reproductive development. Several environmental factors, such as net radiation, air temperature and wind speed, affect the measurement of temperature in bud and leaf tissue (Maes and Steppe , Costa et al.…”

Section: Introductionmentioning

confidence: 89%

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Genotypic Variation for Tolerance to Transient Drought During the Reproductive Phase of Brassica rapa

Guo

Turner

Chen

et al. 2014

J Agronomy Crop Science

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Brassica rapa L. is a genetically diverse parent species of the allotetraploid species, oilseed rape (B. napus) and a potential source of drought tolerance for B. napus. We examined the effect of a 13‐day drought stress period during the early reproductive phase, relative to a well‐watered (WW) control, on subsequent growth and development in nine accessions of B. rapa and one accession of Brassica juncea selected for their wide morphological and genetic diversity. We measured leaf water potential, stomatal conductance, water use, and leaf and bud temperatures during the stress period and aboveground dry weight of total biomass at maturity. Dry weight of seeds and reproductive tissue were not useful measures of drought tolerance due to self‐incompatibility in B. rapa. The relative total biomass (used as the measure of drought tolerance in this study) of the 10 accessions exposed to drought stress ranged from 47 % to 117 % of the WW treatment and was negatively correlated with leaf‐to‐air and bud‐to‐air temperature difference when averaged across the 13‐day stress period. Two wild‐type (B. rapa ssp. sylvestris) accessions had higher relative total and non‐reproductive biomass at maturity and cooler leaves and buds than other types. We conclude that considerable genotypic variation for drought tolerance exists in B. rapa and cooler leaves and buds during a transient drought stress in the early reproductive phase may be a useful screening tool for drought tolerance.

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“…Regarding reproductive development, high temperatures decreased the number of flower buds, while water stress increased flower abortion, resulting in a low number of open flowers. High temperatures (above 27°C) have been previously shown to cause a reduction in flower number for three Brassica species (Morrison & Stewart, ) and water stress increased flower abortion in several species (Guo, Chen, Nelson, Cowling, & Turner, ; Smith & Zhao, ). Kay and Picklum () showed also a lower flower production in drought conditions compared to well‐watered conditions for two Clarkia species.…”

Section: Discussionmentioning

confidence: 99%

Temperature and water stress affect plant–pollinator interactions in Borago officinalis (Boraginaceae)

Descamps

Quinet

Baijot

et al. 2018

Ecology and Evolution

110

127

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Climate change alters the abiotic constraints faced by plants, including increasing temperature and water stress. These changes may affect flower development and production of flower rewards, thus altering plant–pollinator interactions. Here, we investigated the consequences of increased temperature and water stress on plant growth, floral biology, flower‐reward production, and insect visitation of a widespread bee‐visited species, Borago officinalis. Plants were grown for 5 weeks under three temperature regimes (21, 24, and 27°C) and two watering regimes (well‐watered and water‐stressed). Plant growth was more affected by temperature rise than water stress, and the reproductive growth was affected by both stresses. Vegetative traits were stimulated at 24°C, but impaired at 27°C. Flower development was mainly affected by water stress, which decreased flower number (15 ± 2 flowers/plant in well‐watered plants vs. 8 ± 1 flowers/plant under water stress). Flowers had a reduced corolla surface under temperature rise and water stress (3.8 ± 0.5 cm2 in well‐watered plants at 21°C vs. 2.2 ± 0.1 cm2 in water‐stressed plants at 27°C). Both constraints reduced flower‐reward production. Nectar sugar content decreased from 3.9 ± 0.3 mg/flower in the well‐watered plants at 21°C to 1.3 ± 0.4 mg/flower in the water‐stressed plants at 27°C. Total pollen quantity was not affected, but pollen viability decreased from 79 ± 4% in the well‐watered plants at 21°C to 25 ± 9% in the water‐stressed plants at 27°C. Flowers in the well‐watered plants at 21°C received at least twice as many bumblebee visits compared with the other treatments. In conclusion, floral modifications induced by abiotic stresses related to climate change affect insect behavior and alter plant–pollinator interactions.

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Delayed water loss and temperature rise in floral buds compared with leaves of Brassica rapa subjected to a transient water stress during reproductive development

Cited by 19 publications

References 29 publications

Photosynthesis is Reduced, and Seeds Fail to Set and Fill at Similar Soil Water Contents in Grass Pea (Lathyrus sativus L.) Subjected to Terminal Drought

Photosynthesis is Reduced, and Seeds Fail to Set and Fill at Similar Soil Water Contents in Grass Pea (Lathyrus sativus L.) Subjected to Terminal Drought

Genotypic Variation for Tolerance to Transient Drought During the Reproductive Phase of Brassica rapa

Temperature and water stress affect plant–pollinator interactions in Borago officinalis (Boraginaceae)

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