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绿竹Bambusa oldhami是禾本科Gramineae竹亚科Bambusoideae绿竹属Bambusa的优质笋用竹植物,分布于华南丛生竹林亚区和华中亚热带混生竹林亚区南部,5−10月为产笋期[1-3]。绿竹笋形似马蹄,俗称“马蹄笋”,笋肉细嫩,味道鲜美,深受人们喜爱。由于出笋时期温度较高,加之出笋集中,绿竹笋采后容易发生变质、腐败、木质化,储藏难度较大,限制了产品的流通和销售[4-5]。草酸广泛存在于动植物和真菌体内,具有很强的抗氧化性[6]。适当浓度的草酸溶液可以作为抗氧化剂应用于果蔬的保鲜、储藏与运输等。有研究发现:草酸处理能够有效延缓鲜切香蕉Musa nana[7]、荔枝Litchi chinensis[8]、去皮荸荠Heleocharis dulcis[9]的变质腐败,延长保鲜期。关于外源草酸处理对于采后去壳绿竹笋的抗氧化和木质化的影响尚未被报道。因此,本研究以绿竹笋为对象,研究外源草酸对去壳绿竹笋抗氧化酶和木质化的影响,为竹笋的采后储藏保鲜提供依据。
Effects of exogenous oxalic acid on antioxidant enzymes and lignification of Bambusa oldhami shoots
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摘要:
目的 研究外源草酸处理对低温下去壳绿竹笋Bambusa oldhami的保鲜效果及其机制。 方法 用5 mmol·L−1草酸浸泡去壳绿竹笋10 min,置于(6±1) ℃下,定期测定去壳绿竹笋的过氧化氢(H2O2)质量摩尔浓度、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性、硬度、木质素质量分数和木质素代谢关键酶(PAL、4-CL、CAD、POD)的活性及其基因表达水平。 结果 5 mmol·L−1草酸溶液浸泡去壳绿竹笋10 min,能够提高去壳绿竹笋组织内SOD和CAT的活性并延缓H2O2的累积,抑制去壳绿竹笋木质素代谢关键酶(PAL、4-CL、CAD、POD)的基因表达水平和活性的上升,并显著降低木质素质量分数和硬度的上升。 结论 外源草酸处理通过抑制木质素代谢和提高抗氧化酶系统阻止去壳绿竹笋采后木质化进程,从而延缓了其冷藏期内品质的下降。图4参32 Abstract:Objective The purpose is to explore the preservation effect and mechanism of exogenous oxalic acid treatment on bamboo(Bambusa oldhami) shoots at low temperature. Method The peeled bamboo shoots were soaked in 5 mmol·L−1 oxalic acid solution for 10 minutes and stored at (6±1) ℃. The effects of oxalic acid treatment on H2O2 content, SOD activity, CAT activity, hardness, lignin content, key enzymes of lignin metabolism (PAL, 4-CL, CAD, POD) activities as well as their gene expression levels were measured regularly. Result Soaking the bamboo shoots in 5 mmol·L−1 oxalic acid solution for 10 minutes increased the activities of SOD and CAT, delayed the accumulation of H2O2, inhibited the increase of key enzymes of lignin metabolism (PAL, 4-CL, CAD, POD) activities and their gene expression level, and significantly reduced the accumulation of lignin and hardness increase in bamboo shoots without sheaths. Conclusion Exogenous oxalic acid treatment can retard the lignification process in bamboo shoots without sheaths by inhibiting lignin metabolism and improving antioxidant enzyme system. Thus, the quality decline during the cold storage could be postponed. [Ch, 4 fig. 32 ref.] -
Key words:
- botany /
- Bambusa oldhami shoots /
- exogenous oxalic acid /
- lignin metabolism /
- antioxidant system
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https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.20190337