Abstract
Using hydroponic cultures, the effect of high concentrations (10−3 m) of 2-methyl-4-chlorophenoxyacetic acid (MCPA) in the root medium on the water balance of 8–9 week old plants ofPisum sativum L. and of 9–10 week-old plants ofSinapis alba L. was studied. The water balance was determined in the light and in the dark gravimetrically by measuring the intensity of water uptake and transpiration in plants cultivated by the method of root bridges according to Werner. MCPA present in the root medium in illuminated plants decreased rapidly the intensity of both the uptake and the loss components of the water balance. In permanent darkness, MCPA brought about an increase in the intensity of uptake of water and of transpiration. Simultaneous determination of water uptake and transpiration showed that the intensity of transpiration remained higher than the intensity of water uptake. This indicates that in the presence of MCPA in the root medium the relationship between the uptake and the loss components of water balance is not quantitatively equal, enboth in the light and in the dark. The existing disproportion results in the formation of a passive water balance of plants.
Abstract
V pokusoch vo vodnej kultúre sa zist'oval efekt prítomnosti vysokej koncentrácie (10−3 m) kysoliny 2-metyl-4-chlórfenoxyoctovej (MCPA) v koreňovom prostredí na vodnú bilanciu 8 až 9týždňových rastlínPisum sativum L. a 9 až 10týždňových rastlínSinapis alba L. Vodná bilancia sa stanovovala pri osvetlení a v trvalej tme gravimetricky, meraním intenzity súčasne príjmu vody a transpirácie u rastlín vyrastených podl'a Wernerovej metódy koreňových mostov. MCPA prítomná v koreňovom prostredí pri osvetlení znížila rýchlo súčasne intenzitu príjmovej a výdajovej zložky vodnej bilancie. V trvalej tme vyvolala MCPA narastanie intenzity príjmu vody a transpirácie. Súčasné merania príjmu vody a transpirácie ukázali, že intenzita transpirácie zostala vyššia ako intenzita príjmu vody. To ukazuje, že za prítomnosti MCPA v koreňovom prostredí nie je vzt'ah medzi príjmovou a výdajovou zložkou vodnej bilancie kvantitatívne vyrovnaný, tak na svetle, ako aj v tme. Existujúca disproporcia vedie k vzniku pasívnej bilancie rastlín.
Abstract
Изучалось действие высоких кондентраций (10−3 m) 2-Метил-4-хлорфеноксиуксусной кислоты (MCPA) присутствующей в растворе водной культуры 8–9-недельных растенийPisum sativum L. и 9–10-недельных растенийSinapis alba L. на их водный баланс. Определение производили при освещении и при постоянной темноте гравиметрически, одновременным измерением интенсивности поглощения воды и транспирации у растений выращенных по методу корневых мостов по Вернеру. MCPA присутствующая в корневой среде при освещении быстро снизила интенсивность одновременно обоих компонентов водного баланса—поглощения и транспирации. В постоянной темноте MCPA вызвала нарастание интенсивности поглощения воды и транспирации. Одновременное измерение показало, что интенсивность транспирации осталась более высокой, чем интенсивность поглощения воды. При воздействии MCPA отношение между поглощением воды и транспирацией не уравновешено по интенсивности, как в темноте так на свету. В результате диспропорции водный баланс растений становится пассивным.
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Kozinka, V. Water balance of plants during root application of high concentrations of growth substances. Biol Plant 10, 398–408 (1968). https://doi.org/10.1007/BF02920983
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DOI: https://doi.org/10.1007/BF02920983