Salinity Alters the Polyisoprenoid Alcohol Content and Composition of Both Salt-Secreting and Non–Salt-Secreting Mangrove Seedlings

The effects of salinity on the polyisoprenoid alcohol content and composition of the salt-secreting mangrove species Avicennia marina and Sonneratia alba and the non–salt-secreting species Bruguiera gymnorrhiza and Kandelia obovata were studied. The seedlings of mangroves were grown for 5 months under 0% and 3% salt concentrations. The occurrence, content, and distribution of four mangrove seedlings were analyzed by two-dimensional thin layer chromatography. The structural groups of the polyprenols and dolichols in the leaves and roots were classified into two types (I and II). In type I, dolichols predominated over polyprenols (more than 90%), whereas in type II, the occurrence of both polyprenols and dolichols was observed. Polyprenols were not detected in the leaves of A. marina and B. gymnorrhiza under 0% salt (control), but were detected in small amounts in K. obovata leaves; however, significant amounts were found in the 3% salinity group. This finding in A. marina, B. gymnorrhiza, and K. obovata leaves implies a change to the structural group: under 0% salt concentrations, the groups are classified as type I, but become type II under 3% salt concentrations. The occurrence of ficaprenol (C50–55) was found only in the leaves of the non–salt-secreting species B. gymnorrhiza and K. obovataunder 3% salinity and not in the salt-secreting species A. marina or S. alba. It is noteworthy that the polyisoprenoid type in the roots of the four species showed no change under salinity; the two salt-secreting species A. marina and S. alba contained type I under 0% and 3% salt concentrations. On the other hand, type II polyisoprenoids were identified in the non–salt-secreting species B. gymnorrhiza and K. obovata under 0% and 3% salinity conditions. This finding suggested that polyisoprenoids play a protective role against salinity in the mangrove leaves of both salt-secreting and non–salt-secreting species

Smallholders’ willingness to pay for dura marking oil palm seeds

In 2018, around 4 million ha of oil palm smallholdings need to be replanted. Indonesia could utilize this moment to improve smallholdings’ productivity by ensuring the usage of good quality seeds. For the industry, Dura is considered as bad seeds as its thick shells can damage the machine and the oil content is low. Therefore, most mills do not want to buy it, hence the selling price is low. In fact, most smallholdings’ use uncertified seedlings that include many contaminated Dura. Unfortunately, smallholders can only detect this 3 years after the planting and spending a considerable amount of production costs. Actually, to avoid the unnecessary loss a Dura marking technique can be applied to the oil palm seeds. However, most smallholders are unlikely consider Dura usage as an important issue due to the higher weight and higher sales revenue. This study is conducted to analyse smallholders’ willingness to pay (WTP) for seed marking service. Data is collected from 60 independent smallholders in Labuhan Batu Utara, which mostly use the uncertified seedlings. The willingness to pay is measured with Conjectural Variations Approach, revealing 71% of the respondents are willing to pay the Dura seed marking service, although still with a minimum level of WTP. Pearson Chi Square Correlation Test shows that the WTP for Dura Marking Service is only significantly correlated with the smallholders’ knowledge and perception, but not with their land size and experience. Based on the results, a number of policy implication are included

Smallholders’ willingness to pay for dura marking oil palm seeds

In 2018, around 4 million ha of oil palm smallholdings need to be replanted. Indonesia could utilize this moment to improve smallholdings’ productivity by ensuring the usage of good quality seeds. For the industry, Dura is considered as bad seeds as its thick shells can damage the machine and the oil content is low. Therefore, most mills do not want to buy it, hence the selling price is low. In fact, most smallholdings’ use uncertified seedlings that include many contaminated Dura. Unfortunately, smallholders can only detect this 3 years after the planting and spending a considerable amount of production costs. Actually, to avoid the unnecessary loss a Dura marking technique can be applied to the oil palm seeds. However, most smallholders are unlikely consider Dura usage as an important issue due to the higher weight and higher sales revenue. This study is conducted to analyse smallholders’ willingness to pay (WTP) for seed marking service. Data is collected from 60 independent smallholders in Labuhan Batu Utara, which mostly use the uncertified seedlings. The willingness to pay is measured with Conjectural Variations Approach, revealing 71% of the respondents are willing to pay the Dura seed marking service, although still with a minimum level of WTP. Pearson Chi Square Correlation Test shows that the WTP for Dura Marking Service is only significantly correlated with the smallholders’ knowledge and perception, but not with their land size and experience. Based on the results, a number of policy implication are included