{"id":2464,"date":"2010-07-17T17:09:03","date_gmt":"2010-07-17T15:09:03","guid":{"rendered":"http:\/\/localhost\/azgad\/wordpress\/?p=2464"},"modified":"2010-07-17T17:10:34","modified_gmt":"2010-07-17T15:10:34","slug":"clogging-up-the-plumbing-%e2%80%93-a-specific-gene-is-regulating-the-formation-of-water-transporting-vessels-in-plants","status":"publish","type":"post","link":"https:\/\/azgad.com\/?p=2464","title":{"rendered":"Clogging up the plumbing \u2013 A specific gene is regulating the formation of water-transporting vessels, In plants"},"content":{"rendered":"

.
\nVascular development in plants is controlled by a newly
\n identified gene regulator that can block the formation
\n of water-transporting vessels<\/strong>
\n.
\nEvery vascular plant contains an extensive network
\nof xylem and phloem, specialized tissues that respectively
\ntransport water and nutrients throughout the plant body.
\nUntangling the processes that determine how these two
\n types of vasculature develop has proven challenging,
\nbut a team led by Taku Demura of the RIKEN
\nimportant novel regulator of xylem formation.
\nSeveral years ago, Demura and colleagues identified
\n a family of seven VASCULAR-RELATED NAC-
\nDOMAIN (VND) transcription factors; one of these,
\nVND7, appears to activate a number of genes related
\nto xylem development2. \u201cThe data suggest that VND7
\nlikely functions as the principal regulator of vessel
\ndifferentiation,\u201d Demura says. However, the activity
\nof this factor appears to depend closely on the proteins
\nwith which it partners, and his team has subsequently
\nfocused on identifying these co-regulators.<\/p>\n

.
\nIn their most recent screen, the researchers identified
\nVNI2, a novel transcriptional regulator that physically
\n interacts with VND7 and whose expression appears to
\n correlate closely with vascular development in both root
\nand stem tissue. However, although both VND7 and VNI2
\nare categorized as \u2018NAC domain\u2019 proteins, VNI2 exhibited
\n one surprising difference from other members of its family.
\n\u201cIt is known that most of the NAC transcription factors are
\ntranscriptional activators,\u201d says Demura. \u201cIn contrast,
\nVNI2 is a transcriptional repressor.\u201d
\n.
\nIndeed, VNI2 appears to act primarily as an inhibitor
\nof vascular development (Fig. 1), and plants overexpressing
\nthis factor exhibited profound defects in xylem formation.
\nThese abnormalities were highly similar to those observed
\n in plants overexpressing modified, inhibitory variants of
\nVND7, further supporting a partnership between these
\ntwo factors. In parallel, Demura and colleagues determined
\nthat VNI2 specifically represses several genes known to be
\ninduced by VND7 in the course of xylem differentiation.
\nThese findings indicate that the VNI2\u2013VND7 complex
\ncontributes directly to the timing and localization of vascular
\ndevelopment, although this is most likely not the sole purpose
\nof this repressor. \u201cOur paper shows that VNI2 is expressed in
\nvarious other cell types in addition to xylem vessels, and we
\nwant to know its other functions,\u201d says Demura. Accordingly,
\ntheir initial protein\u2013protein interaction data suggest that VNI2
\nmight pair with other, non-xylem-specific NAC proteins, whose
\nfunctional characteristics remain enigmatic.
\n.
\n\u201cWe still need to study the VND genes [more closely],\u201d says
\nDemura, \u201cfor a better understanding of xylem cell differentiation.
\nSince xylem cells are a major source of lignocellulosic biomass,
\nsuch knowledge could be applied to potential renewable materials
\nand biofuels.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

. Vascular development in plants is controlled by a newly identified gene regulator that can block the formation of water-transporting vessels . Every vascular plant contains an extensive network of xylem and phloem, specialized tissues that respectively transport water and nutrients throughout the plant body. Untangling the processes that determine how these two types of … <\/p>\n

\u05d4\u05de\u05e9\u05d9\u05db\u05d5 \u05d1\u05e7\u05e8\u05d9\u05d0\u05d4<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10],"tags":[290,136,513,158],"class_list":["post-2464","post","type-post","status-publish","format-standard","hentry","category-10","tag-290","tag-136","tag-513","tag-158","nodate","item-wrap"],"_links":{"self":[{"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts\/2464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2464"}],"version-history":[{"count":2,"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts\/2464\/revisions"}],"predecessor-version":[{"id":2466,"href":"https:\/\/azgad.com\/index.php?rest_route=\/wp\/v2\/posts\/2464\/revisions\/2466"}],"wp:attachment":[{"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/azgad.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}