NDLI: Gas exchange of root hemi-parasite Striga hermonthica and its host Sorghum bicolor under short-term soil water stress

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Gas exchange of root hemi-parasite Striga hermonthica and its host Sorghum bicolor under short-term soil water stress

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Gas exchange of root hemi-parasite Striga hermonthica and its host Sorghum bicolor under short-term soil water stress

Content Provider	Springer Nature Link
Author	Iue, T. Yamauchi, Y. Eltayeb, A. H. Samejima, H. Babiker, A. G. T. Sugimoto, Y.
Copyright Year	2013
Abstract	The gas exchange of the upper fully expanded leaf of the root parasite Striga hermonthica and of its host Sorghum bicolor was measured under wet and dry conditions to identify the mechanisms of the devastating effects of the parasite on its hosts under drought. The short-term water stress severely reduced photosynthetic rate in infected sorghum, but less in S. hermonthica. Soil water stress did not affect leaf respiration rate in either S. hermonthica or infected sorghum. This suggests that under dry conditions both infected sorghum and S. hermonthica decreased autotrophic carbon gain. The transpiration rate of S. hermonthica, a major driving force for assimilate uptake from the host, was higher and less affected by water stress than that of infected sorghum. Stomatal density on the abaxial surfaces of the leaves was higher in S. hermonthica than in sorghum. Both S. hermonthica infection and water stress decreased stomatal conductance of the sorghum leaves. S. hermonthica, irrespective of soil water status, had greater stomatal aperture on the adaxial and abaxial surfaces of its leaves than infected sorghum. These results indicate that the higher transpiration rate of S. hermonthica even under water stress, achieved through higher stomatal density on the abaxial surfaces of the leaves and greater stomatal aperture on both surfaces of the leaves, may induce the maintenance of water and solute transfers from the host to the parasite leading to severe damage to the host under drought.
Starting Page	773
Ending Page	777
Page Count	5
File Format	PDF
ISSN	00063134
Journal	Biologia Plantarum
Volume Number	57
Issue Number	4
e-ISSN	15738264
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-05-24
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Horticulture

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Gas exchange of root hemi-parasite Striga hermonthica and its host Sorghum bicolor under short-term soil water stress

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Gas exchange of root hemi-parasite Striga hermonthica and its host Sorghum bicolor under short-term soil water stress