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Roots play a key role in drought-tolerance of poplars as suggested by reciprocal grafting between male and female clones.
Plant Physiology and Biochemistry ( IF 6.5 ) Pub Date : 2020-05-20 , DOI: 10.1016/j.plaphy.2020.05.014
Shengxian Chen 1 , Lita Yi 1 , Helena Korpelainen 2 , Fei Yu 1 , Meihua Liu 1
Affiliation  

Drought stress influences the growth of plants and thus grafting has been widely used to improve tolerance to abiotic stresses. Poplars possess sex-specific responses to drought stress, but how male or female rootstock affect the grafted plant is little known. To explore the mechanisms underlying changes in drought tolerance caused by grafting, we investigated the changes in growth, leaf traits, gas exchange and antioxidant enzyme activities of reciprocally grafted seedlings between Populus euramericana cv. "Nanlin895" (NL-895) (female) and Populus deltiodes cv."3412" (NL-3412) (male) under water deficit stress with 30% field capacity for 30 d. Results showed that drought stress affected adversely growth, morphological, and physiological characteristics in all seedlings studied. Grafted seedlings with male roots can effectively alleviated the inhibition of growth induced by drought stress, as shown by higher WUE, activities of SOD, POD and CAT, and lower levels of lipid peroxidation. Male seedlings with female roots were found to be less tolerance to drought than non-grafted male clones and female scions with male roots, but more tolerance than non-grafted female clones. This results suggested that drought tolerance of grafted seedlings is primarily caused by the rootstock, although the scion also affects the grafted plant. Thus, paying attention on the root genotype can provide an important means of improving the drought tolerance of poplars.



中文翻译:

根系在杨树的耐旱性中起着关键作用,这在雄性和雌性克隆之间相互嫁接表明。

干旱胁迫影响植物的生长,因此嫁接已被广泛用于提高对非生物胁迫的耐受性。杨树对干旱胁迫具有性别特异性的反应,但是雄性或雌性砧木如何影响嫁接的植物尚不清楚。为了探究嫁接引起的耐旱性变化的潜在机制,我们调查了美洲杨之间相互嫁接的幼苗的生长,叶片性状,气体交换和抗氧化酶活性的变化。“ Nanlin895”(NL-895)(女)和Populus deltiodes cv 。“ 3412 (NL-3412)(雄性)在缺水胁迫下具有30%的田间持水量,持续30 d。结果表明,干旱胁迫影响了所有研究幼苗的生长,形态和生理特性。具有较高的水分利用效率,较高的SOD,POD和CAT活性以及较低的脂质过氧化水平表明,具有雄性根的嫁接幼苗可以有效减轻干旱胁迫对生长的抑制作用。发现具有雌性根的雄性幼苗比未移植的雄性无性系和具有雄性根的雌性接穗对干旱的耐受性低,但比未移植的雌性无性系更耐旱。这个结果表明嫁接幼苗的抗旱性主要是由砧木引起的,尽管接穗也影响嫁接的植物。从而,

更新日期:2020-05-20
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