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Tagyiri shakli barg – Hazonrez

Dar ravishi ba omilhoi muhiti beruna mutobiqshavii rastaniho, dar baze holatho, tagyiryobii shakli bargi rastaniho mushohida karda meshavad. In barghoi shakldigarkarda vazifahoi digarro niz ijro mekunand, ki on ba barghoi asosi khos nest. Masalan, baze barghoi zirk (zilol) ba khor tabdil yoftaand. Onho nazar ba barghoi muqarrari obro kam bukhor karda, inchunin rastaniro az khurdani hayvonot emin nigoh medorand. Bargi kaktus (subbor) niz ba khor tabdil yoftaast. Dar mushung barghoi nugi ba tanobak tabdil yofta, ba takyagoh pechida poyaro rost nigoh medorand.

tagiriBargi rastanihoi hasharotkhur, ki dar khokhoi moddahoi nitro- geniashon kam mesabzand, khele ajib ast. Dar botloqzori torfi pashshakhurak (rosyanka) nom giyohi kuchake mesabzad. Pahnaki bargi pashshakhurak bo pashmakchaho pushida buda, onho moei chaspak mebarorand. Hamin ki hasharot ba barg nishast, dar moei chaspaki barg mechaspad. Qatrahoi hamchun shabnam jilodori moei chaspak hasharotro ba khud jalb mekunad. Pas az nishastani hasharot avval muyakchahoi pashmak va sipas khudi pahnaki barg ba darun kham khurda, hasharotro pechonida megirand. Vaqte ki pahnak va muyakchahoi pashmaki barg rost (kushoda) meshavand, az hasharot faqat jildi sakht (khitin) boqi memonadu bas. Tamomi boftahoi zindai hasharotro bargi pashshakhurak jabbida hazm mekunad.

Hazonrez. Tiramoh barg- ho tadrijan zard, norinji va surkhtob megardand. Zero khlorofilli bargi sabz vayron meshavad va barg rangi sabzashro gum mekunad. Pigmenthoi (moddahoi rangvori) rangi norinji va zarddoshtai hujay

rahoi barg boqi memonand va ba khubi ayon meshavand. CHunki in pigmentho nazar ba khlorofill ba sharoithoi nomusoidi fasli tiramoh tobovarand. Inchunin, rangi surkhi barg ba moddahoi ran- gini shirai hujayraho niz vobasta ast.

Dar muddati nashunamoi rastaniho dar bargi onho botadrij moddakhoi baroi rastani nolozim va bazan zahrnok gun meshavand. Ba tufayli fasli khazonrez – tiramoh in moddaho az rastani dur karda meshavand.

Hazonshavii barg yak shakli mutobiqati rastany ba faslhoi tiramohu zimiston meboshad. Zero, reshai bisyor rastaniho az zamin obi khunukro jabbida nametavonad. Va agar bargi buttavu darakhton namerekht, on goh onho az norasoii ob nobud meshudand. Ammo bargi baze rastanihoi guldor dar zimiston ham namerezad. Hulang khalanj va nordonak barin rastanihoi hameshasabz az jumlai onhoyand. Barg

hoi rezavu ustuvori in rastaniho, ki obro khele kam bukhor mekunand, dar tagi barf zimistonro meguzaronand. Darakhti gor (lavr) va bisyor giyohho ham, ma- salan, shahtuti zamini, sebarga. zarchu- bak va kishtzori rastanikhoi galladonagi bo barghoi sabzashon zimistonro meguzaronand.

Bargi darakhtoni hameshasabzi suzanbarg doimi nest. Onho yakchand sol sabzida tadrijan merezand. Dar barobari in dar navdahoi navi in ras- taniho barghoi nav mesabzand.

  1. Baroi chi shakli bargi rastaniho tagyir meyobad?
  2. Tagyiryobii shakli bargro bo misolho sharh dihed.
  3. Tagyiri shakli barg baroi rastani chi ahamiyat dorad?
  4. CHaro tiramoh rangi barg tagyir meyobad?
  5. Hazonrezi chi ahamiyat dorad?
  6. Rastanihoi hameshasabzi mahallatonro nombar kuned.
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