Academic Journal
Comparative analysis of end wall resistivity in xylem conduits
| العنوان: | Comparative analysis of end wall resistivity in xylem conduits |
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| المؤلفون: | SPERRY, JOHN S., HACKE, UWE G., WHEELER, JAMES K. |
| المصدر: | Plant, Cell & Environment ; volume 28, issue 4, page 456-465 ; ISSN 0140-7791 1365-3040 |
| بيانات النشر: | Wiley |
| سنة النشر: | 2005 |
| المجموعة: | Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: | The hydraulic resistivity ( R , pressure gradient/flow rate) through end walls of xylem conduits was estimated in seven species of diverse anatomy and affinity including a vessel‐bearing fern, a tracheid‐bearing gymnosperm, and angiosperms with versus without vessels. Conduit lengths were measured with a silicone injection method which was easier and more accurate than the usual paint injection. The R declined linearly with the removal of end walls as stems were shortened from 10 to 0.3 cm. This relationship gave the minimum R with no end walls present, or the lumen resistivity ( R L ). This was indistinguishable from the Hagen–Poiseuille value. The maximum R with all end walls present gave R C , the resistivity of end wall and lumen in series. Average end‐wall resistivity ( R W ) was the difference R C − R L and the ‘wall fraction’ was R W / R C . Wall fraction was approximately constant, averaging 0.54 ± 0.07. This suggests that end wall and lumen resistivities are nearly co‐limiting in vascular plants. Average conduit length was proportional to the diameter squared across species ( r 2 = 0.94). Together with a constant wall fraction, this was consistent with the end wall resistance ( r w , pressure difference/flow rate) being inversely proportional to conduit length. Lower r w in longer conduits is consistent with their having more end wall pits than shorter conduits. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1111/j.1365-3040.2005.01287.x |
| الاتاحة: | http://dx.doi.org/10.1111/j.1365-3040.2005.01287.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3040.2005.01287.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3040.2005.01287.x |
| Rights: | http://onlinelibrary.wiley.com/termsAndConditions#vor |
| رقم الانضمام: | edsbas.D5F03692 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1111/j.1365-3040.2005.01287.x |
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