Abstract:
:We present a novel measurement setup for monitoring changes in leaf water status using nondestructive terahertz time-domain spectroscopy (THz-TDS). Previous studies on a variety of plants showed the principal applicability of THz-TDS. In such setups, decreasing leaf water content directly correlates with increasing THz transmission. Our new system allows for continuous, nondestructive monitoring of the water status of multiple individual plants each at the same constant leaf position. It overcomes previous drawbacks, which were mainly due to the necessity of relocating the plants. Using needles of silver fir (Abies alba) seedlings as test subjects, we show that the transmission varies along the main axis of a single needle due to a variation in thickness. Therefore, the relocation of plants during the measuring period, which was necessary in the previous THz-TDS setups, should be avoided. Furthermore, we show a highly significant correlation between gravimetric water content and respective THz transmission. By monitoring the relative change in transmission, we were able to narrow down the permanent wilting point of the seedlings. Thus, we established groups of plants with well-defined levels of water stress that could not be detected visually. This opens up the possibility for a broad range of genetic and physiological experiments.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Born N,Behringer D,Liepelt S,Beyer S,Schwerdtfeger M,Ziegenhagen B,Koch Mdoi
10.1104/pp.113.233601subject
Has Abstractpub_date
2014-04-01 00:00:00pages
1571-7issue
4eissn
0032-0889issn
1532-2548pii
pp.113.233601journal_volume
164pub_type
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